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An Unhandled Exception Occurred - Cannot Find Module ‘posix-character-classes’

Scenario

 
One of our developers was getting this error, after she wrote the latest code in devops. This application was Angular 11 with ASP.net core 3.1.
 

Exact Error

 
AggregateException: One or more errors occurred. (One or more errors occurred. (The NPM script ‘start’ exited without indicating that the Angular CLI was listening for requests. The error output was: An unhandled exception occurred: Cannot find module ‘posix-character-classes’
 
After a bit of research, we found that we need to update the Angular and npm version.
 
Command
  1. npm update    
  2. ng update    
  3. // alternatively    
  4. npm update -g    
  5. np update -g     
However, this solution did not work in our case. After further research, I observed that the clientApp’s (angular application) folder was having node_modules folder from Azure DevOps as shown.
 
The error output was: An unhandled exception occurred: Cannot find mod
 
This was supposed to create based on user build and not from source control. Therefore, I deleted the folder from the Angular application and rebuilt the solution. And this time it worked and resolved the issue.
 
Solution
 
Remove the node_modules folder from the Angular application.
  1. ng serve –open  
ng serve –open
 
Alternatively, run the solution from Visual Studio. 
 
Regards
 
Rijwan