yarn : File C:\Users\AES\AppData\Roaming\npm\yarn.ps1 cannot be loaded because running scripts is disabled on this system. For more information, see about_Execution_Policies at https:/go.microsoft.com/fwlink/?LinkID=135170. At line:1 char:1 + yarn run dev + ~~~~ + CategoryInfo : SecurityError: (:) [], PSSecurityExcep tion + FullyQualifiedErrorId : UnauthorizedAccess

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This error message suggests that PowerShell scripts are not enabled on your system, which is why you are unable to run the yarn command.

To fix this problem, you need to change the execution policy on your system so that PowerShell scripts can run. You can do this by following these steps:

1. Open PowerShell as an administrator.

2. Run the following command to check the current execution policy:

    sqlCopy codeGet-ExecutionPolicy
   

3. If the output is "Restricted", then you need to change the execution policy. To change the execution policy, run the following command:

    pythonCopy codeSet-ExecutionPolicy RemoteSigned
   

   This will set the execution policy to "RemoteSigned", which allows you to run scripts that are signed by a trusted publisher.

4. Confirm the change by entering "Y" when prompted.

5. Close and reopen PowerShell.

6. Try running the yarn command again and see if the issue is resolved.

Note that changing the execution policy can potentially expose your system to security risks. Therefore, it is recommended to set the execution policy back to "restricted" after you have finished running your scripts. You can do this by running the following command:

pythonCopy codeSet-ExecutionPolicy Restricted

I hope this helps! Let me know if you have any further questions.