Error: a job for operation Upload on site already running

Hi,
I am using Sen4Cap through Creodias and the user interface. I created a new site and some of the lower level products are already uploading. I received my LPIS data for crop type a bit later and wanted to upload the data. However, it does not let me upload it, giving me an error ‘a job for operation Upload on site … already running’.
I also tried to pause my current jobs but this did not help.

Could this error be related to some processes running or could there be a mistake with the data I am trying to upload? Any hints for solving this issue would be appreciated.

Thanks!
Katrin