[ERPi] What is the easiest way to clear all the maps from a location?

Have created a file with one line, tried to load that as replace, with the thinking that if it isn't in the file it gets deleted but that doesn't work,  We've got over 1k worth of maps that need to be cleared out.  Doing one delete at a time isn't good.
In addition, when trying to import a file "an error occurred while importing the file" would be nice to know the error or where the error log is... argh..

Now we can't even export the maps with "An error occurred while exporting the file." No idea where to even look to troubleshoot.  Even restarted the ERPi service....  this is soo very frustrating.