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Robin AlbergRobin Alberg 

Process to set PriceBook Unexpectedly Stopped Working

I have a process to set the Pricebook on an order on commit and it has been working fine up until today (naturally since we are supposed to go live tomorrow). Suddenly when I try to save the order I get an Unhandled Fault:

Workflow Action Failed to Trigger Flow
The record couldn’t be saved because it failed to trigger a flow. A flow trigger failed to execute the flow with version ID 3016A000000PVYZ. Flow error messages: <b>An unhandled fault has occurred in this flow</b><br>An unhandled fault has occurred while processing the flow. Please contact your system administrator for more information. Contact your administrator for help. 

The Error Occured During Flow Email says that "Pricebook2ID__NotFound=01s6A000002m1E4" (Id of my pricebook" but I have run queries in my org on that ID and it returns that price book. 

Please help this will delay acceptance of project significantly
Robin AlbergRobin Alberg
Even more horrific-ly, deactivating the process and then turning it back on again appears to have solved the problem. How can I go live if this will mysteriously fail? 
Robin AlbergRobin Alberg
Hi, I really really really need help on this and salesforce tech support won't help me because it's on Process Builder. I have had to stop and restart the process numerous times. It always works for awhile and then fails on order creation with the above error. Please does anyone have any idea where to start figuring this out?