react Error: Unable to resolve module mobx-react

Mobx needs to be used in the development process. After installing and running according to the instructions on the official website, an error is always reported: error: unable to resolve module mobx react from E: (uploadcode, update, test, app, app. JS: mobx react could not be found within the project or in these directions:
node_ modules
…\ node_ Modules
at the beginning, I thought that the network was not good when I downloaded it. I didn’t download it completely, so I uninstalled what I just installed and installed it again, but there was still this error finally, I can only look at the error information to see if there is a solution. Finally, this sentence attracted my attention: mobx react could not be found within the project or in these directions:
node_ modules
…\ node_ modules

On node_ Modules and_ I can’t find mobx react in the modules folder, so I went into these two folders and found that… – node_ Modules folder contains the content I just downloaded, but node_ There is no module, so I enter the node from the terminal_ In the modules folder, download and install the dependency again
after downloading, rerun the project and no error will be reported
summary: if there is no dependency for you to download in any folder, go to the corresponding folder and download it again, so that all the folders mentioned in the error message have the dependency for you to download

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