First verify that you have your seed written down or copied on a plain text file. If you have your seed encrypted proceed to decrypting the seed inside the wallet to get possession of your seed.
After you confirm the seed is in your possession and that it shows the same address that you were using the pin proceed to the following steps.
Delete the Agama folder located in directory C:\Users\*username*\AppData\Roaming\Agama. Only do this after verifying the step above.
Run Agama app uninstaller and wait for it to finish the process.
We are going to be extra sure that everything works by rebooting the computer.
Run the Agama App Installer as normal.
Your Agama wallet should be able run without any error now. Make sure to only follow this guide with the steps mentioned before.