Many users encounter this error when using "2L" or "cracked" versions where the amtlib.dll file has been replaced. If you are using a modified version for archival purposes:
If you are a Creative Cloud subscriber who installed Encore CS6 through the "Legacy Apps" section: Open the . Sign out of your account. Restart your computer. Sign back into Creative Cloud. Many users encounter this error when using "2L"
Relaunch Premiere Pro. It should ask you to sign in or enter a serial number. Many users encounter this error when using "2L"