Once again, I can't express how important it is to accept help when help is offered. Thank you Robbyn7.

There are many errors with your site, the first has been corrected:
line 1099 of customers.php was calling a non existent function from one of your previous v1.38 modules.

Your customers list has now been restored in admin.

I'm now working on fixes for the rest of the errors :)

Stay tuned.