SOLVED Additional Themes in Limesurvey not working

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Hey there,
I've been recently trying out Limesurvey. So far I enjoy it and it works quiet stable beside two issues I have not been able to fix until now.
I really tried hard to fix the issues by myself, but since I still wasn't able to achieve what I want, I am reaching out for help. Here the two issues of which on is rather critical.

• File Manager shows permission error upon loading.
  First I tried setting the permisions as told in the limesurvey documentation, but upon further searching I came across an open bug ticket (https://bugs.limesurvey.org/view.php?id=16212). Apparently it is a know bug and noone seems to really care... Since this the File Manger doesnt't work on their own demo (https://demo.limesurvey.org/index.php?r=admin/authentication/sa/login) I stopped searching and found a workaround.
  => In case you have a fix I'd be interested

• The critical one: Any other installed or extended Theme appears to be broken. I really want to change the default and extend a theme to make it my own. Upon opening an extended / imported / other installed theme, I get greeted with an error message in the preview window:

ERROR!
Calling "__tostring" method on a "stdClass" object is not allowed in "__string_template__b55aa4d0480829447d1e9202fbd9338e3599742834899f6fdab87be7c4eaab2b" at line 76.

When I choose a broken theme for a survey, the survey won't display properly and the page stays blank, with a 500 internal error in the console.
I spend multiple hours trying to fix the issue.
My findings so far:
It does not appear to be a permission problem, since I tried chmod 777 on the folders and files pointed out in the limesurvey documentation. My only lead so far could be a bug in the php version. I came across a limesurvey forum post (https://forums.limesurvey.org/forum/installation-a-update-issues/121252-theme-option-returns-ise-500-error-version-4-2-3-200511) where the user zlobocki pointed out that he had to change his php version from 7.4 down to 7.2. While limesurvey recommends to use version 7.4 (https://manual.limesurvey.org/Installation_-_LimeSurvey_CE) I still wanted to try it out since the container runs 7.3. Since the is mostly a read only filesystem, I was unable to change either the php version nor to modify the default themes to fit my needs (yeah I thought of that dirty trick...)

Long story short: is there anything I can do to fix the issue and make at least the themes work properly?

Sorry for the long text and thank you in advance!

[d19dotca]

I can't help unfortunately as I don't use LimeSurvey, but anything app-related should be reported in the actual category for the app (in your case it'd be this one), since it's more of a packaging / app issue rather than a Cloudron-specific issue, just for the future.

[girish]

@logo It seems the recommended version for LimeSurvey is PHP 7.4 per https://manual.limesurvey.org/Installation_-_LimeSurvey_CE#Make_sure_you_can_use_LimeSurvey_on_your_website . So, I have pushed a new package now that uses PHP 7.4.

On a fresh install, I can extend themes and also edit some options. I only clicked around randomly and things seemed to work. Can you give it a test?

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@d19dotca Thank you, next time I will post in the right category

@girish I just gave it a test and it works like a charm! Thank you very much