Unable to login to Plesk: ERROR: bad arguments (key_info.php:32)

Symptoms

Plesk shows the following error after login:

ERROR: bad arguments (key_info.php:32)

Cause

Corrupted license key file. The same error may appear when clicking on Retrieve if a license was terminated on a licensing server side, but was still in use in Plesk.

Resolution

Regenerate license key file. In order to do that, install production license using the following CLI command:

plesk bin license -i XXXXXX-XXXXXX-XXXXXX-XXXXXX-XXXXXX

where XXXXXX-XXXXXX-XXXXXX-XXXXXX-XXXXXX is a license key number.

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