Joomla plug Installation Request failed: 500

Hello,

Possibly the issue is related to Joomla updated to 3.9 before updating Themler to the latest version, that supports Joomla 3.9.
Please follow these steps to fix the current theme:
https://answers.themler.io/articles/173620/how-to-fix-the-error-after-updating-to-joomla-3-9
After this update the theme to the latest Themler version that supports Joomla 3.9.

Sincerely,
Nettie

Same error
When I write the plungin I have a white popup
joomla 3.9

Hello,

Is it possible to open the theme for editing? Is it default Themler theme or a previously edited one?

Sincerely,
Nettie