I have installed C2RCC V0.14 plugin with SNAP4.0.2. When I try to run the OLCI processor using all default settings and none of the optional settings, I get an error
Invalid source product, raster ‘SZA’ required"
This looks similar to a previously solved problem related to view angles.
I realise the C2RCC processor is still in pre-release. I’m not sure if this is a bug or my mis-use of the plugin.
I just tried it myself and it worked.
Can you check if you have chosen a proper source product and if it contains the SZA tie-point grid. Also please check if the correct plugin is installed. Open the processor and open the about dialog (Help–>About). There you should see version 0.14.
It turns out that the mini files that we get for the LJCO ROI do not contain SZA, OZA etc in the tie_geometries.nc
I have tried it on a full L1B scene and it works as you also found. So, definitely a data problem, not a software problem.