2.3.1 Invalid File Type
The error "Invalid file type" will appear if one or both of the files uploaded are incorrect. The most common reason for this is inserting the Microsoft Excel file (*.xls) in the ASCII Text file (*.txt) upload field and vice versa. Simply click the Back button and insert the correct file into each field.
If you are certain that the correct file is in each upload field, a more serious issue may be the cause for this error. One of your files may be corrupt or can otherwise not be read correctly by the Contribution Wizard. In this case, it is suggested that you contact the webmaster for assistance.