Hi here,
I’m the developer of the CAMERA wrapper for Galaxy (don’t confuse with the developer of CAMERA itself) and also administrator of the workflow4metabolomics instances : https://galaxy.workflow4metabolomics.org and https://workflow4metabolomics.usegalaxy.fr
I’m arriving on this thread because we have almost the same issue with another tool " metams_runGC’ 
Error in chromPeaks(from)[, "is_filled"] : subscript out of bounds
Still an mystery at this point.
Can you discribe your problems with the instance?