After performing all the steps like Calibrating the TM Image into Radiance (Radiance Calibration) Adjusting the radiance unit using band math b1/10 Converting the interleave into BIL format And inputing various parameter into FLAASH Atmospheric Correction Model Input Parameters After clicking on Apply I get following Envi error File: C\Master Thesis\ TM\ TM_FLAASH_template.txt Problem: No carriage returns found. Unable to read this file as an ASCII file. Then i click on OK button and i get the following message Problem: The FLAASH program exited with the following errors: ACC error: at top - level error handler IDL error: Expression must be a structure in this context:BRUN Please suggest, I am near the deadline of Master thesis submission and this FLAASH program is not working. Your small contribution will be highly acknowledged. Hari.