On some systems ExpRead will fail with the following error:
ExpRead error message: Could not read coordinate of vertex 0 of ....
This is due to the reader using the local setting of your machine that probably use a comma instead of a decimal point. That can be solved by enforcing the "en_US.UTF-8" settings.
just add to your .bashrc the following line:
export LC_NUMERIC=en_US.UTF-8