Author Archives: Robins

Error occurred during Microsoft Visual Studio execution. Msb8020 reported an error

Project scenario:

Version inconsistency and error report during using Visual Studio

Problem Description: error msb8020

Problems encountered during execution:

Error
error msb8020: the build tools for visual studio 2012 (V120) (platform toolset = ‘Visual Studio 2012 (V120)’) cannot be found. To build using the visual studio 2012 (V120) build tools, please install visual studio 2012 (V120) build tools. Alternatively, you may upgrade to the current Visual Studio tools by selecting the Project menu or right-click the solution, and then selecting “Upgrade Solution…”.

Cause analysis:

Use Microsoft Visual Studio Version for inconsistent reasons

Solution:

Find the solution manager, right-click and select Properties

configuration properties – & gt; General – & gt; Platform toolset – & gt; Select the current version of visual studio

Summary

step by step, lyy come on

Solution to communication link failure with error in idea startup project

Problem description 

com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

Solution

Option 1   Tomcat VM configuration parameters: – DJava. Net. Preferipv4stack = true

Option 2   ① Nginx configuring agent MySQL:

    ② Modify database connection: spring. Datasource. Url = JDBC: mysql://localhost:9999/demo?characterEncoding=utf8

Reference from:

https://blog.csdn.net/baidu_21349635/article/details/121032229
https://adong.blog.csdn.net/article/details/111501253

Error message for HLS Video Fusion for the second time when using mars3d

Using Mars technology’s mars3d API and several video fusion written according to the sample code, clicking different web page tags will fly to different locations and turn on Video Fusion there.

    var video3D = new mars3d.graphic.Video3D({
        // type: mars3d.graphic.Video3D.Type.Image,
        // url: videoInfo.pic_url,
        type: mars3d.graphic.Video3D.Type.Video,
        dom: $("#trailer"),
        position: videoInfo.position,
        cameraPosition: videoInfo.cameraPosition,
        style: videoInfo.style,
        showFrustum: videoInfo.showFrustum,
    });
     gLayer.addGraphic(video3D);
    map.setCameraView(videoInfo.view);

However, glayer. Addgraphic (video3d) often appears; report errors. The first call is sure to succeed, and then the second call may fail. After a failure, all methods fail, which will also prevent the call of other methods, such as flight. Error message: unable to:_ 0xc3d9ee add addeventlistener.

After debugging, I found that this DOM element was obtained for the first time

the second time, it was just (forgot the screenshot):

dom:{
	selector:#trailer
}

Therefore, the specific reason for the problem is not clear, but it must be related to jQuery. The second time, I don’t know why I didn’t get the DOM elements completely and then pass them in
No, jQuery is fine anyway:

    var video3D = new mars3d.graphic.Video3D({
        // type: mars3d.graphic.Video3D.Type.Image,
        // url: videoInfo.pic_url,
        type: mars3d.graphic.Video3D.Type.Video,
        dom: document.getElementById("trailer"),
        position: videoInfo.position,
        cameraPosition: videoInfo.cameraPosition,
        style: videoInfo.style,
        showFrustum: videoInfo.showFrustum,
    });
     gLayer.addGraphic(video3D);
    map.setCameraView(videoInfo.view);

[Solved] git error – remote: http basic: access denied

After using the git push command, an error is reported as follows:

another error is:

git Failed to connect to port xxxx: Connection refused

based on these two situations, the account and password logged in at the time of the first use are largely inconsistent with the current warehouse account password, so the user will be prompted to connect without permission or refuse access. At this time, the best way is to reset the GIT account password!

Solution:

first enter the local warehouse directory, then right-click “git bash here”, and enter the following instructions in the pop-up terminal input box:

git config --system --unset credential.helper

Then use the git push command again to guide you to enter the account and password again. After you enter it correctly, you can connect to the remote warehouse successfully!!

Unit Android converts c# class to JSON file and reports an error

Original file connection: unity about the error report of newtonsoft. JSON reference!!!! (resolved)_ Xiaoyan can’t write code blog – CSDN blog

I’m afraid the original article will be deleted once.

1、 Download the newtonsoft.json.dll library

https://www.nuget.org/packages/Newtonsoft.Json/

After downloading, change the downloaded file to a. Zip file and unzip it. After decompression, find the newtonsoft.json.dll file in the directory:… \ newtonsoft. JSON. 13.0.1 \ lib \ netstandard2.0 and copy it to the… \ assets \ plugins \ netstandard2.0 directory of unity.

2、 Modify unit settings

ProjectSetting-> Player-> API compatibility level changed to. Net 4. X

Create a new link.xml file in the assets directory of the unity project:

<linker>
	<assembly fullname="System.Core">
		<type fullname="System.Linq.Expressions.Interpreter.LightLambda" preserve="all" />
	</assembly>
</linker>

[Solved] Android Error: import android.support.annotation.NonNull

I: problem description

I got an Android project in 2018. The error message of a java file in the project is as follows

import android.support.annotation.NonNull

The exception occurred when introducing Android support, because most Android projects now use Android x to replace the past Android support library, but it depends on the demand. Let’s talk about how to solve this problem on older Android projects.

II: solution

Copy the following line of code to replace the error code

import androidx.annotation.NonNull;

Easywasmlayer reports an error uncaught (in promise) domexception when playing a video

As a video streaming media player developed by tsingsee Qingxi video, easyplayer series projects support integration and secondary development. You can also download and try to obtain real test results. Among them, the new h.265 player branch easywasm player is the mainstream player for web page playback.

When we use easywasmlayer to play video in the project, the console will always report the error uncaught (in promise) domexception. In this article, we will analyze what caused the error.

In fact, this problem is caused by the browser’s blocking automatic playback. The user has set automatic playback, so this situation will occur when the first screen is loaded. To deal with this situation, you can disable the audio.

Changing openaudio to true disables audio or prevents the player from loading as soon as the first screen comes up, but this is obviously not the problem in this project. Instead, open the playback page, select the device to start playing, and then start loading the player. After modification, it can play normally:

Easyplayer, a player independently developed by tsingsee Qingxi video, is currently being effectively used on multiple platforms and supports integration. It also includes players such as easyplayer RTSP, easyplayer RTMP, easyplayerpro and easyplayer.js, which has higher availability and lower latency. Welcome to know.

Internalerror: GPU sync failed error (How to Solve)

1. Error reporting: (from Python deep learning p178-179)

When vscode runs the following code in Jupiter notebook, an error is reported: internalerror: GPU sync failed

from tensorflow.keras.models import Sequential
from tensorflow.keras import layers
from tensorflow.keras.optimizers import RMSprop

model = Sequential()
model.add(layers.Flatten(input_shape=(lookback // step, float_data.shape[-1])))
model.add(layers.Dense(32, activation='relu'))
model.add(layers.Dense(1))

model.compile(optimizer=RMSprop(), loss='mae')
history = model.fit_generator(train_gen,
                              steps_per_epoch=500,
                              epochs=20,
                              validation_data=val_gen,
                              validation_steps=val_steps)

2. Solution:

(1) Don’t open too many ipynb file windows. There is only one running window left. Restart and there should be no problem.

(2) Some friends said that they might have something to do with the wallpaper engine. Just turn it off. I haven’t verified this yet.

However, I found that when the wallpaper engine dynamic desktop is displayed, the GPU utilization will increase sharply:

Vant weapp uses the dialog pop-up box to prompt for path error

When writing wechat applet, use the dialog pop-up box of the third-party vant web to prompt the path error

But it is used according to the official tips

  After repeated modification, the path still reports an error. According to the hierarchy, the path is no problem

 

  The problem of path error will still be reported!

  Finally, after repeated attempts, the package/dist needs to be removed and can be used normally

 

Encapsulation SDK Call Error: runtime error [How to Solve]

In addition to accessing RTSP and gb28181, it also completes the docking with the equipment and video stream transmission through private protocols such as hiksdk and EHOME.

The client server deployed the easycvr project and crashed after running for a period of time. Open the log. The error message is as follows: “runtime error: invalid memory address or nil pointer dereference”.

This error is a typical error caused by the direct use of the go pointer without initializing the pointer after it is declared. See the addstream function in line 516 of the error information view code. The following code indicates that this function is the key to the error and is saved as the error file information, so this is not the key to the error.

Check the error message at line 606:

The parameters in line 606 represent: channel name, stream address, channel ID, handle using SDK, channelnum and stream type. Therefore, compared with the previous error message, it will be associated with the problem of calling the SDK handle. Then view the local. DB database for comparison:

Field Dahua_ device_ Handle has two values of 0 and – 1. All these two values are only available when login fails or errors occur. The program uses this value directly. This will cause the call to. DLL and. So to crash.

Before calling the SDK, make the following judgment when passing in the handle:

If loginHandle <=0 {
	Return -1, fmt.Errorf(“handle param error:%d”, loginHandle)
}

Or directly make if judgment in the encapsulated DLL. This is for double insurance.

if (loginHandle <= 0) {
	return -1;
}

Solution to device or resource busy error in docker redeployment service

Recently, I encountered a problem. When I redeployed a service in docker, I failed to start the service after executing the SH start.sh command or docker compose up – D command, and reported a device or resource busy error.

Then I docker PS a look, good guy, not only failed to start, the service is not available yet
this is because when docker is deployed, all the original things will be RM repeated and then rebuilt. Well, the deletion was successful, but the deployment was not started successfully.

Take a look at the error reported at that time:


failed to remove root filesystem for 9b13c255d03757c456651506ada5566a5b5e5a87b851e3621dcejf823: remove /var/lib/docker/overlay/9b13c255d03757c456651506adaa2fb660f75a5b5e5a87b851e3621dce0a368d/merged: device or resource busy

Device or resource busy, which means that the device or resource is busy and you can’t delete it.

Then I went to the/var/lib/docker/overlay/9b13c255d03757c756651506adaa2fb660f75a5b5e5a87b851e3621dce0a368d/merged directory. It was empty and could not be deleted manually.

terms of settlement

1. Find the processes occupying this directory

Command: grep ID/proc/*/mounts
examples are as follows:
grep 9b13c255d0375757c456651506adaa2fb660f75a5b5e5a87b851e3621dce0a368d/proc/*/mounts

After executing the command, it is obvious that two processes are using it:


/proc/25086/mounts:overlay /data0/docker/overlay2/9b13c255d03757c456651506adaa2fb660f75a5b5e5a87b851e3621dce0a368d /merged overlayrw,relatime,lowerdir=/data0/docker/overlay2/l/F4BQHNVPHGRKWXFRUIHXUMAHZ2:/data0/docker/overlay2/l/.....
/proc/25065/mounts:overlay /data0/docker/overlay2/9b13c255d03757c456651506adaa2fb660f75a5b5e5a87b851e3621dce0a368d /merged overlayrw,relatime,lowerdir=/data0/docker/overlay2/l/......

2. Kill the process

Command: Kill – 9 process ID
examples are as follows:
kill – 9 25086
kill – 9 25065

Note: it is important to see whether some processes can be deleted directly. If they are deleted all at once, it will be bad in case other services are affected.

3. Continue to delete the directory. The operation is successful

Command: RM – RF error file path
example:
RM – RF/var/lib/docker/overlay/9b13c255d03757c456651506adaa2fb660f75a5b5e5a87b851e3621dce0a368d/merged

After deleting the directory file, re execute the SH start.sh or docker compose up – D command to start the service, and the start is successful!