Better error message when LOFAR beam not compiled and applybeam is used

Created by: sabourke

I'm running prefactor and I get the following error:

std exception detected: Shared library applybeam not found in CASACORE_LDPATH or (DY)LD_LIBRARY_PATH
libdppp_applybeam.so: cannot open shared object file: No such file or directory
libdppp_applybeam.so: cannot open shared object file: No such file or directory

Should it be looking externally for applybeam? Running DPPP with the parset below reproduces the problem. This is using DP3 v4.1. Any suggestions appreciated.

msin.datacolumn=CORRECTED_DATA
applybeam.beammode=element
numthreads=10
applybeam.updateweights=True
applybeam.type=applybeam
applybeam.invert=True
applybeam.usechannelfreq=False
steps=[applybeam]
msin=/var/tmp/prefactor/working/Pre-Facet-Calibrator/L232873_SB218_uv.dppp.ndppp_prep_cal
msout.storagemanager=Dysco
msout.datacolumn=CORRECTED_DATA
msout.storagemanager.databitrate=0
msout=/var/tmp/prefactor/working/Pre-Facet-Calibrator/L232873_SB218_uv.dppp.ndppp_prep_cal'