[qgis-qwc2] Printing/Exporting Layers of different map themes

[Daniel Cebulla]

Hello there,

May you can help me with the following issue.
We have running a QWC2 within a docker stack using the qwc-services.
Within the QWC2 there is the possibility the organize the layers in 
different map themes based on different QGIS projects. If the parameter 
"allowAddingOtherThemes" within the config.json is set to 'true', users 
can load other themes in addition to the current one to the map.
The issue occurs if you want to print this map now to pdf. The printing 
works only, if there are only layers from the initial theme in the map. 
But if I try to print the map with additional layers, I get the 
following error:

<ServiceExceptionReport version="1.3.0">
<ServiceException code="UnknownError">
The server encountered an internal error or misconfiguration and was 
unable to complete your request.
</ServiceException>
</ServiceExceptionReport>

As far as we know, this is not an error in relation to the 
qwc-print-service. This occurs also using the default print option 
without the service implemented. Is there anyone with the same issue or 
having ideas for a solution to fix this?

In addition there is a similar error using the raster-export tool. If 
you have more then one theme loaded and want to export a raster of the 
map, only the initial layers appear within the exported image.

Thanks in advance and greetings,
Daniel



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