I am pretty new to this, try to run a application in runtime mode, but I am getting '% unexpected validation error'  I downloaded a trial version of IDL 7.1 so I can get the library, I thought using VM is free, is this a license issue?  this is what is in my license.dat file, #RSI_PRODUCT_NAME:IDL Runtime 7.1 #RSI_FEATURE_NAME:eval_idlrt #RSI_PRODUCT_VERSION:7.100 PACKAGE eval_idlrt idl_lmgrd 7.100 046C68719F40 \     COMPONENTS="idl_rt:7.100 idl_wavelet:7.100 idl_dm:7.100 \     idl_dicomex_rw_rt:7.100 idl_dicomex_net_rt:7.100 \     idl_dicomex_scp:7.100" thanks, Albert