friendica.mbbit.de

Hi @Friendica Support
I encounter this error:

Warning: touch(): Utime failed: Permission denied in [PATH REMOVED]/vendor/smarty/smarty/libs/sysplugins/smarty_template_compiled.php on line 178

Randomly at different locations on the front end. And idea what I have done wrong?
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Checking the file attributers returns:

-rw-rw-r-- 1 friendica friendica 9461 Sep 14 12:59 [PATH REMOVED]/vendor/smarty/smarty/libs/sysplugins/smarty_template_compiled.php


www-data is a member of the friendica group.
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getent group friendica returns:
friendica:x:1001:www-data
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