Ensure that you're using the latest version of High School Technical Gamerrar 1. Check the official website or forums for updates, and install the latest version to see if it resolves the issue.
Verify that your GTA 5 installation files are complete and not corrupted. You can try re-downloading the installation files or checking their integrity using a file verification tool.
Right-click on the Gamerrar 1 executable file and select "Run as administrator" to ensure it has the necessary permissions to access the installation files and authenticate the process.