module manager is down after update

[mostafamoaz]

we just updated our prestashop from 1.7.8.3 to 1.7.8.4 
now we get this message 

Oops... looks like an unexpected error occurred.

Compile Error: Cannot declare class qrstr, because the name is already in use

[Symfony\Component\Debug\Exception\FatalErrorException 0]

[Paul C]

Two things you can try:

Clear the cache ( and/or delete the directories shop-root/var/cache/prod or shop-root/var/cache/dev). This might be enough to fix it.

Failing that you could disable/remove that free 3rd party module (gaffiliatemarketingfree) and see if that fixes it. If you can't access the modules menu option in the back office, then you'll need to backup and delete the module directory via ftp. With most minor upgrades you can get away with leaving 3rd-party modules enabled but not always.

Edited March 7, 2022 by Paul C
typo (see edit history)

[mostafamoaz]

2 hours ago, Paul C said:

Two things you can try:

Clear the cache ( and/or delete the directories shop-root/var/cache/prod or shop-root/var/cache/dev). This might be enough to fix it.

Failing that you could disable/remove that free 3rd party module (gaffiliatemarketingfree) and see if that fixes it. If you can't access the modules menu option in the back office, then you'll need to backup and delete the module directory via ftp. With most minor upgrades you can get away with leaving 3rd-party modules enabled but not always.

just copied phpqrcode.php from installation zip file and everything works fine now 

thanks for hinting that the issue was with gaffiliatemarketingfree i didnt notice that error