Hello group,
i have a site wp5.7 on php7.4
After correction few syntax fatal error from upgrade 5 to 7 and trying to get access to my admin panel that allowed me to pionted my database with an graphic interface for managing my customer informations to be publish in the web site.
the link i use is www.blablabla.com/directory/cp/index.php
(fake link to showed the path way) 
here the error i got and need help to find how to fix it, please.
ERROR BELOW:
There was a problem validating your software license.
-
Verify your license code is in defaults.php
-
Try reissueing your license.
If you still receive problems, please contact support.
Any ideas to provide me??
Gilles