MVC - Fix Error - An exception of type 'System.FormatException' occurred in mscorlib.dll but was not handled in user code Additional information: Input string was not in a correct format.

An exception of type 'System.FormatException' occurred in mscorlib.dll but was not handled in user code

Additional information: Input string was not in a correct format.

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to fix it replace

 private string DisplayedErrorMessage = "Either {0] or {1} is required";

with

 private string DisplayedErrorMessage = "Either {0} or {1} is required";