Umbrella Header [...].h not found

When trying to build my framework, I suddenly receive the following error:

Umbrella Header [...].h not found

Honestly, I'm not even sure why there should be a header file in the first place since the framework is pure swift. There are no objective-c files in the project at all.

I don't have an idea where to begin the investigation for this issue since I haven't really used objective-c ever and am therefore not too familiar with the topic. Can someone here maybe point me in the right direction?

Umbrella Header [...].h not found
 
 
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