IIIF short URLs not working

Images in the list described above are also available via the short URL: http://localhost:8080/exist/apps/sade/textgrid:18wz6.

When I try to get an image by short URL I obtain the following error:

HTTP ERROR 500

Problem accessing /exist/apps/sade/textgrid:18wz6. Reason:

Server Error

Caused by:

javax.servlet.ServletException: javax.servlet.ServletException: An error occurred while processing >request to /exist/apps/sade/textgrid:18wz6: Invalid URI: xmldb URI scheme does not start with >xmldb:: textgrid:18wz6 at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:146) at org.eclipse.jetty.server.handler.gzip.GzipHandler.handle(GzipHandler.java:724)