Are you facing the frustrating issue of 'Could not copy obj debug netcoreapp2 to bin debug' while working on your .NET Core application? This error can be a roadblock in your development process, but fear not - we've got some troubleshooting tips to help you resolve the issue.

1. Clean and Rebuild: Sometimes, the issue can be resolved by simply cleaning the solution and rebuilding it. This often helps in clearing out any cached or corrupt files that may be causing the copying error.

2. Check File Permissions: Ensure that the destination folder (bin debug) has the necessary permissions for the copying process. Sometimes, restricted access can prevent the files from being copied successfully.

3. Analyze Build Output: Look closely at the build output window for any specific error messages related to the copying process. This can provide valuable insights into what exactly is causing the problem.

4. Update Dependencies: Check if there are any outdated or incompatible dependencies in your project. Updating them to the latest versions can sometimes resolve issues related to file copying.

5. File Path Length: Long file paths can sometimes cause issues with copying files. Try shortening the file paths or restructuring your project to avoid excessively long paths.

6. Anti-Virus Interference: In some cases, overactive anti-virus software can interfere with the file copying process. Temporarily disabling the anti-virus or adding an exception for the project folder can help resolve the issue.

7. Visual Studio Updates: Ensure that you have the latest updates installed for Visual Studio and .NET Core. Sometimes, bugs related to file copying are addressed in newer versions of the software.

By following these troubleshooting tips, you should be able to resolve the 'Could not copy obj debug netcoreapp2 to bin debug' error and continue with your development process smoothly. Remember to document any changes you make during troubleshooting, as this can help in identifying the root cause of the issue. Happy coding!