After Upgrade 11.5.9 to 12.1.1 error open customization form

Error when trying to open a custom form after upgrading to R12

Oracle error -6550: ORA-06550: line 1, column 7:
PLS-00306: wrong number or types of arguments in call to 'INIT'
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored has been detected in fnd_global.initialize[fnd_init_sql].

I've already checked the solution proposed.

Please help.

Thanks & Regards,
Laura