system queryexception list has no rows for assignment to sobject apex

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1. Getting "System.QueryException: List has no rows for assignment to

   

2. Salesforce: System.QueryException: List has no rows for assignment to SObject (3 Solutions!!)

   

3. X2.exe Assert Failure

   

4. System.QueryException: List has no rows for assignment to SObject for

   

5. X2.exe Assert Failure

   

6. System.QueryException: List has no rows for assignment to SObject