The errors reported are as follows: StVO PL/SRC/stereoframehandler. CPP: 1266:35: error: ‘RND’ was not declared in this scope
color = scalar (color_dist (RND), color_dist (RND), color_dist (RND), color_dist (RND))
explanation: random_ In the Linux implementation, device () reads the/dev/urandom device, random_ The purpose of device () is to generate a true random number. The rand () function uses the linear congruence method to generate a random number, but this random number is actually a pseudo-random number
original address: https://blog.csdn.net/keneyr/article/details/105595613#commentBox
However, randm_ Device() is only valid under Linux, not under windows
solution: add #include & lt; in front of the stereoframehandler.cpp file; random> just fine
Category Archives: How to Fix
Error report of mongodb startup under Linux
Version:MongoDB 5.0.3
1. Use the configuration file to start the error 1:
View log:
The reason is an error in the configuration file:
#mongod.conf
net:
bindIp: localhost,172.20.10.9 # 172.20.10.9 LAN IP for host computer
After 172.20.10.9 of bindip is deleted, it can be started successfully, but the host cannot connect to mongodb. At this time, by changing bindip to bindipall: true, it means that all IPS are allowed to connect to this mongodb
If you want to configure multiple IP addresses but do not want all IP addresses to be accessible, the above instructions are used, and the partition cannot be started. Query the network and learn that it is configured through [IP1, IP2], and the result is also an error:
Conclusion: If it is only accessed locally, you can configure localhost in bindip,
If other IPS want to access, they can only configure bindip: 0.0.0.0 or bindipall: true
2. Use the configuration file to start error 2:
Problem cause: caused by abnormal shutdown
Solution: delete the. Lock file under the data directory, and then specify the data directory to start by — dbpaht or add the — repair parameter. After successful startup, start it by using the configuration file method
3. Add in replica set No response when arbitrating nodes
Problem: by executing the shell in the master node, rs.addarb (host: port) does not respond, and the arbitration node cannot be added. At this time, the version is 5.0.3
Solution: reduce the version to 4.0.1
Scrapy runs a crawler with an error importerror: cannot import name suppress
2021-11-02 15:56:03 [twisted] CRITICAL:
Traceback (most recent call last):
File "/Users/tanya/Library/Python/2.7/lib/python/site-packages/twisted/internet/defer.py", line 1418, in _inlineCallbacks
result = g.send(result)
File "/Users/tanya/Library/Python/2.7/lib/python/site-packages/scrapy/crawler.py", line 104, in crawl
six.reraise(*exc_info)
File "/Users/tanya/Library/Python/2.7/lib/python/site-packages/scrapy/crawler.py", line 86, in crawl
self.engine = self._create_engine()
File "/Users/tanya/Library/Python/2.7/lib/python/site-packages/scrapy/crawler.py", line 111, in _create_engine
return ExecutionEngine(self, lambda _: self.stop())
File "/Users/tanya/Library/Python/2.7/lib/python/site-packages/scrapy/core/engine.py", line 67, in __init__
self.scheduler_cls = load_object(self.settings['SCHEDULER'])
File "/Users/tanya/Library/Python/2.7/lib/python/site-packages/scrapy/utils/misc.py", line 46, in load_object
mod = import_module(module)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/importlib/__init__.py", line 37, in import_module
__import__(name)
File "/Users/tanya/Library/Python/2.7/lib/python/site-packages/scrapy/core/scheduler.py", line 7, in <module>
from queuelib import PriorityQueue
File "/Users/tanya/Library/Python/2.7/lib/python/site-packages/queuelib/__init__.py", line 1, in <module>
from queuelib.queue import FifoDiskQueue, LifoDiskQueue
File "/Users/tanya/Library/Python/2.7/lib/python/site-packages/queuelib/queue.py", line 7, in <module>
from contextlib import suppress
ImportError: cannot import name suppress
resolvent:
pip uninstall attrs
pip uninstall queuelib
pip install queuelib==1.5.0
pip install attrsVue executes NPM run Dev and reports an error: missing script: dev
1. Execute NPM run Dev and report an error
2. Reason: the package.json file is “serve”: “Vue cli service serve”
3. Solution: execute the command and replace with: NPM run serve
The Vue mobile terminal cannot use string.replaceall, and the error message is blank
When developing Vue, the replaceall function is used, and there is no problem debugging on the PC side
However, when packaging and deploying to the mobile end test, it is found that some pages are blank and the console only displays error {}
After troubleshooting, the replaceall function reports an error. Replace it with replace
Shell script running error bash: JPS: command not found
Problem Description:
The script code is as follows:
#!/bin/bash
for i in node1 node2 node3
do
echo "======== $i =========="
ssh $i "jps" | grep -v Jps
done
The error message is as follows:
Solution:
Execute the following command: cat/etc/profile & gt& gt; ~/. Bashrc (each machine needs to execute)
the operation results are as follows:
Running Django (2.2) project in Python 3.7.9 reports an error
1. Questions:
resolvent:
Modify the Django/views/debug.py file as follows: encoding =’utf-8 ‘
The MAC system installs MySQL client, and the error is solved_ config not found
The MAC system installs MySQL client, and the error is solved_ config not found
Using PIP3 install MySQL_ Client error
The error message is as follows: prompt: oserror: MySQL_ config not found
python setup.py egg_ info Check the logs for full command output
mysql_ Config not found
Solve the problem according to the error report
Prompt that the file does not exist. Use find to find the file and verify whether the file exists
find/- name MySQL_ Config
you can see that the file exists. It is preliminarily judged that the environment variable 
is not configured
resolvent
Add the queried address to the environment variable
export path = $path:/usr/local/mysql-5.6.38-macos10.12-x86_ 64/bin
Verify again
Download again, the prompt is successful, and the problem is solved 
Problem regression
Because MySQL has been downloaded before, the environment variable configuration may be deleted when operating other contents. This method is not applicable to all cases
Imshow() reports an error after C + + opencv 4.5.1 configures the environment
I checked the Internet for a long time and basically said that the path of imread() was wrong
Later, I saw under a comment that opencv4.5.1 needs to be removed Linker – input – attach dependencies Opencv in_ world451.lib
After deletion, the picture can be read normally
Python calls C to generate so library and reports an error: undefined symbol
After using C + + to implement some algorithm functions, there is an error when calling Python:
AttributeError: /..../libHessian4Nii.so: undefined symbol: callVesselSegNiiAccording to Du Niang, it is because the function name will be renamed in the C + + compiled file (which is convenient to realize the overload function), so the function name cannot be found when calling the script.
The solution is to use extern “C” Just enclose the header file to be exposed. Examples are as follows:
extern "C"{
int callVesselSegNii(char* oriNiiFile, char* maskNiiFile, char* save_path);
}
After recompilation, call the normal!!!!
Idea ignores compilation errors and runs in eclipse compilation mode
1. Enter file settings compiler java compiler
Modifying the configuration:
use compiler: change javac to eclipse
select “processed on errors” in eclipse options
Change project bytecode version to 6
Enter project configuration: project structure – & gt; Project -& gt; Project name interface
Setting: Project language level: setting 6 version
Set run/debug configurations
Run/Debug Configurations
For web projects, set “before launch” to “make, no error check” (the default should be make)
for ordinary projects, set “before launch” to “build, no error build” (the default should be build)
Return to the editing area and click build – & gt; build Project
QT error expected: ‘before’ qmessagelogger‘
QT error expected: ‘before’ qmessagelogger ‘?
Metaphysical problems:
on November 4, 2021, compilation repeatedly reported errors. Expected ‘:’ before ‘qmessagelogger’:
Unable to find the reason, and then waited for a while, this error suddenly appeared:
Add a semicolon “:” and compile it. It’s very interesting…