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 Salesforce – List has no rows for assignment to SObject
if you using following code in Apex and Error should throw like “List has no rows for assignment to SObject”.
Account a = [Select name from acoount where id =: strId];
Try to avoid the error following code in you Apex.
List<Account> lstAccount = [Select Id, name from acoount where id =: strId];
if (lstAccount.size() > 0) {
     String Name = lstAccount[0].Name;}