Good day
I have successfully created a backup on my website https://swiss-skydiving.ch/. I have imported this to a subdomain https://t2.swiss-skydiving.ch/ and it works perfectly so far. Unfortunately, I have noticed that over 90% of the pages show the same error message when the page is called up.
For example the page
https://t2.swiss-skydiving.ch/skydiving-aargau-und-umgebung
The error message appears here:
500
Joomla\CMS\HTML\HTMLHelper JABehavior not found.
However, this works on the main domain:
https://swiss-skydiving.ch/skydiving-aargau-und-umgebung
Can you maybe help me how to fix this problem?
Kind regards
Ramon
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