vba to call macro in another workbook

hi,

could you please help me with this code it says object defined error 1004 I have a workbook named muddmmyy the date is variable I want to call a macro in "ThisWorkbook" sheet

I want to call it from another workbook could please help many thanks

Application.Run ("MU" & Format(Sheets("Main").Range("C6").Value, "ddmmyy") & ".xlsm") & "'!ThisWorkbook.Macro"