WebCLI does not load

The WebCLI does not load. The browser gives the following error messages:

07:08:37.309 Invalid object WebCLI:22:49
07:09:01.242 [Show/hide message details.] GET
https://digicult2.thulb.uni-jena.de/digicult/rsc/WebCLI/gui/css/webcli.css
[HTTP/1.1 200 200 15ms]
07:09:01.292 [Show/hide message details.] GET
https://digicult2.thulb.uni-jena.de/digicult/rsc/WebCLI/gui/css/bootstrap.min.css
[HTTP/1.1 200 200 9ms]
07:09:01.700 Source map error: SyntaxError: JSON.parse: unexpected end of data at line 1 column 1 of the JSON data
Resource URL: https://digicult2.thulb.uni-jena.de/digicult/rsc/WebCLI/gui/css/bootstrap.min.css
Source Map URL: bootstrap.min.css.map[Learn More]