The following code attempts to take a macro-enabled (.xlsm) workbook, create a folder with it's name in the same directory where the workbook is located, and then move the workbook into said folder and change its name.

        Dim xlsm_wb         As Workbook
        Dim xlsm_path       As String
        Dim xlsm_name       As String
        Dim fold_path       As String
               
        Set xlsm_wb = Application.Workbooks("repositorio nóminas.xlsm")
            xlsm_path = xlsm_wb.Path
            xlsm_name = xlsm_wb.FullName
            fold_path = xlsm_path & "\repositorio nóminas"
        
        Debug.Print xlsm_name
        Debug.Print fold_path & "\matenimiento.xlsm"
        
        MkDir fold_path                                                    <- Error 75 here 
        Name xlsm_name As fold_path & "\matenimiento.xlsm"                 <- or here

As you can see, I get error 75 in the second-to-last instruction, and if I comment it out and attempt to simply move the .xlsm into the folder without creating it manually, it also gives me the same error.