Why am I getting the message, "Error Saving to xls File" now that I've set up my new GPM software?

This is most likely because the default AutoSave location is in a location that your computer may not have "write" access to. In addition, behind the scenes, the program is also attempting to save a log file of every communication between the coordinator and each module to the same folder. These are both stored on C:\Program Files(x86)\ANKOMRF\Gas Pressure Monitor or C:\Program Files\ANKOMRF\Gas Pressure Monitor. 

If, in C drive, you see both folders Program Files and Program Files (x86), the GPM program will save to the Program Files (x86) folder. Have your system administrator give your computer write access to the correct folder/file path and the error should be resolved.