Installing Extension from 3.x on 4.0.4 Error 500 behavior::modal not found

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Christiano73
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Installing Extension from 3.x on 4.0.4 Error 500 behavior::modal not found

Post by Christiano73 » Mon Nov 29, 2021 8:50 pm

Dear all,

I am new to Joomla. I have a running Installation Joomla 4.0.4.
I have tried to install an Extension that was made for 3.x.
During the installation the Error 500 behavior::modal is shown.

I guess this routine is new or obsolete in 4.0.4.
Any experience to resolve this error ?

Thanks for any hint or guidance
Christian
Last edited by toivo on Mon Nov 29, 2021 11:07 pm, edited 1 time in total.
Reason: mod note: moved from 4.x Migrating and Upgrading

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AMurray
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Re: Installing Extension from 3.x on 4.0.4 Error 500 behavior::modal not found

Post by AMurray » Mon Nov 29, 2021 9:39 pm

I have tried to install an Extension that was made for 3.x.
Extensions designed for 3.x are not guaranteed to run in 4.0.

Installing extension
  • It would have helped if you advised which extension you're trying to install.
  • Joomla 4.x is only a couple of months old, extensions for what you want to do may not be available, yet.
  • It's best to check the Extension Directory periodically as you might find a 4.0 version of your extension there eventually.
  • Did you check to see if the extension had a Joomla 4.0 version?
  • Did you read the installation instructions for that extension and note if it was 4.0 compatible or not?
Restoring site

My suggestions:
  1. Restore from backup (backing up your site is clearly and strongly advised in the "Install Extensions screen).
  2. Start over with a clean install of Joomla 4 if you haven't done too much work on the site.
Regards - A Murray

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sozzled
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Re: Installing Extension from 3.x on 4.0.4 Error 500 behavior::modal not found

Post by sozzled » Mon Nov 29, 2021 9:41 pm

“If you think I’m wrong then say, ‘I think you’re wrong.’ If you say ‘You’re wrong!’, how do you know?” :)


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