My Modtran run fails - what shall I do?

[rese_support]

Modtran writes a file called 'tape6' or 'xxx.tp6' which contains all essential information about the processing. The tape6 may be displayed using the MODO-function 'File:Show Textfile'. It will contain further information about missing or faulty parameters of your current tape5. Correct the input tape5 and run MODTRAN again until everything is ok. Please use the MODTRAN manual for further debugging (due to the enormouse number of options, support on such issues is limited).