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Hello Seema, I believe this error occurs because ARP/wARP has not been setup within the startup file for the shell that you are using. For instance, if you use bash (the default under most Linux distributions) you need to add the following line to the .bashrc file in your home directory: source /path/to/arpwarp/arpwarp_setup.bash If this doesn't fix the problem, or my instructions are unclear, please don't hesitate to contact me directly. Saul Hazledine On Jul 19, 2011, at 1:51 PM, Seema Nath wrote: > I've recently installed arp/warp(7.1) in ccp4 6.2 in linux i686,the problem is whenever I'm trying to run arp/warp navigator or any other programs under arp/warp it gives the error " cannot get environment variable for warpbin" > Please help. > Thanks in advance. > > Seema Nath