What is a backtrace?

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A backtrace is debugging output generated by Pathway Tools when you hit an error condition that causes a break.

If the window in which you first started the program contains a listing such as the following, it means you are in the debugger (resulting from a break):

Restart actions (select using :continue): 
 0: Return to Pathway Tools command level
 1: Pathway Tools top level 
 2: Exit Pathway Tools 
[changing package from "USER" to "ECOCYC"] 
[1] EC(3):

Please type the following command and include the result that the debugger prints in your email:

:zoom :count :all

You can probably resume operation by typing :continue followed by the number of the line on which the text "Pathway Tools top level" occurs. In the case shown here you would type :continue 1 followed by Return.