Pentaho 5.0.1 CE - SolutionEngine.ERROR_0003 - No solution path specified

Hello,
I installed bi-server 5.0.1 CE from the manual zip. I get in my logs the following error(s):

ERROR [org.pentaho.platform.engine.services.solution.SolutionEngine] :SOLUTION-ENGINE:: SolutionEngine.ERROR_0003 - No solution path specified

Without any stack trace. The BI server works fine. I tried to change the path to the pentaho-solutions folder under the web.xml:

<context-param>
<param-name>solution-path</param-name>
<param-value>path/to/pentaho-solutions</param-value>
</context-param>

Without any significant change (nothing changed whether the path is specified or not).
The jackrabbit configuration (pentaho-solutions/system/jackrabbit/repository.xml) is the default one.

What could be the cause for this error message?

Thanks!