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Jayaramu T 9Jayaramu T 9 

can any one please help on this i am keep on getting Flow Error mails from my sandbox

FlowApplication <info@salesforce.com>

Error element myDecision (FlowDecision).
The flow failed to access the value for myVariable_current.Product2.Product_Category__c because it hasn't been set or assigned.

Flow Details
Flow Name: Asset_Product_Category
Type: Record Change Process
Version: 1
Status: Active
Org: 3D Systems, Inc. (00D3D000000DPRO)
Flow Interview Details
Interview Label: Asset_Product_Category-5_InterviewLabel
Current User: Salesforce CPQ (00534000009QVTC)
Start time: 11/16/2018 3:13 AM
Duration: 0 seconds
How the Interview Started
Salesforce CPQ (00534000009QVTC) started the flow interview.
Some of this flow's variables were set when the interview started.
myVariable_old = Asset (02i34000006VTtTAAW)
myVariable_current = Asset (02i34000006VTtTAAW)
ASSIGNMENT: myVariable_waitStartTimeAssignment
{!myVariable_waitStartTimeVariable} Equals {!$Flow.CurrentDateTime}
Result
{!myVariable_waitStartTimeVariable} = "11/16/2018 3:13 AM"
DECISION: isChangedDecision2_myRule_1_Product2Id
Skipped this outcome because its conditions weren't met: isChangedRule_2_myRule_1_Product2Id
Outcome conditions:
1. {!myVariable_old} (Asset (02i34000006VTtTAAW)) Is null false
2. {!myVariable_old.Product2Id} (null) Does not equal {!myVariable_current.Product2Id} (null)
Logic: All conditions must be true (AND)

Executed the default outcome

Salesforce Error ID: 2018615494-11105 (-2052676383)
Khan AnasKhan Anas (Salesforce Developers) 
Hi Jayaramu,

Greetings to you!

Every time a flow interview fails, Salesforce sends an error email in the default language of the user who ran the flow. The email is sent to either the admin who last modified the associated flow or the Apex exception email recipients. The email includes the error message from the failure and details about each flow element that the interview executed.

If the interview failed at multiple elements, the recipients receive multiple emails, and the final email includes an error message for each failure. If a flow uses fault connectors, its interviews can fail at multiple elements.

Please refer to the below links which might help you further with the above issue.

https://help.salesforce.com/articleView?id=vpm_troubleshoot_email.htm&type=5

https://salesforcesidekick.com/2016/09/26/how-to-troubleshoot-visual-flow-process-builder-with-fault-emails/

https://success.salesforce.com/answers?id=9063A000000l1yp

https://success.salesforce.com/answers?id=90630000000ZcmvAAC

https://help.salesforce.com/articleView?id=vpm_admin_error_email.htm&type=5

I hope it helps you.

Kindly let me know if it helps you and close your query by marking it as solved so that it can help others in the future. It will help to keep this community clean.

Thanks and Regards,
Khan Anas