Unhandled Exception:
System.ArgumentNullException: Value cannot be null.
Parameter name: String
at System.Number.StringToNumber (System.String str, System.Globalization.NumberStyles options, System.Number+NumberBuffer& number, System.Globalization.NumberFormatInfo info, System.Boolean parseDecimal) [0x00006] in <8f2c484307284b51944a1a13a14c0266>:0
at System.Number.ParseInt32 (System.String s, System.Globalization.NumberStyles style, System.Globalization.NumberFormatInfo info) [0x00014] in <8f2c484307284b51944a1a13a14c0266>:0
at System.Int32.Parse (System.String s) [0x00007] in <8f2c484307284b51944a1a13a14c0266>:0
at Problem_4.Month_Printer.Program.Main () [0x00005] in <4aa683836b104db192c84153e0ff0211>:0
[ERROR] FATAL UNHANDLED EXCEPTION: System.ArgumentNullException: Value cannot be null.
Parameter name: String
at System.Number.StringToNumber (System.String str, System.Globalization.NumberStyles options, System.Number+NumberBuffer& number, System.Globalization.NumberFormatInfo info, System.Boolean parseDecimal) [0x00006] in <8f2c484307284b51944a1a13a14c0266>:0
at System.Number.ParseInt32 (System.String s, System.Globalization.NumberStyles style, System.Globalization.NumberFormatInfo info) [0x00014] in <8f2c484307284b51944a1a13a14c0266>:0
at System.Int32.Parse (System.String s) [0x00007] in <8f2c484307284b51944a1a13a14c0266>:0
at Problem_4.Month_Printer.Program.Main () [0x00005] in <4aa683836b104db192c84153e0ff0211>:0