SOLVED SiteApplication.php Error after update 3.10 to 4 Topic is solved

[sylwekb]

Error after update 3.10 to 4. I have a Casiopeia template in the backend. What to change to make these errors at the top of the page disappear?

Notice
: Undefined offset: 0 in
/.../libraries/src/Application/SiteApplication.php
on line
522


Notice
: Trying to get property 'template' of non-object in
/.../libraries/src/Application/SiteApplication.php
on line
545


Warning
: Creating default object from empty value in
/.../libraries/src/Application/SiteApplication.php
on line
545


Error
The template for this display is not available. Please contact a website administrator.


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UPDATE SOLVED
It is necessary to set the yellow star as default after updating the template.

[mjparadac]

Thanks for sharing the solution to this problem when using that template.
Has it worked properly after doing that?

Regards,

[sylwekb]

Yes, all the errors described above are gone.