After updating to webcon 2025 every worfklow shows "Failed with an unknown exception Error identifier:" at the start/when reloading the page

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After updating to webcon 2025 every worfklow shows "Failed with an unknown exception Error identifier:" at the start/when reloading the page.
The workflow is still usable, however this is still a bit upsetting.
When pasting the error code into the administration tools, it says that no error was found.

One worfklow however does show an error:
ex: WebCon.WorkFlow.Data.Solr.Exceptions.SolrInitException: SOLR not initialized
---> CommonServiceLocator.ActivationException: Activation error occurred while trying to get instance of type ISolrOperations`1, key ""
---> System.Collections.Generic.KeyNotFoundException: The given key 'SolrNet.ISolrOperations`1[WebCon.WorkFlow.Data.Solr.Collections.BPSActivity]' was not present in the dictionary.

I already cleared the SOLR index.

I would really appreciate help.