list has no rows for assignment to sobject error in vf page

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1. Salesforce: Visualforce System.QueryException: List has no rows for

   

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

   

3. Salesforce: System.QueryException: List has no rows for assignment to

   

4. Salesforce: List has No Rows for Assignment to SObject: Error

   

5. apex

   

6. Salesforce: List has no rows for assignment to SObject test class