If you have received an error code in Michigan Treasury Online (MTO), enter it into the search bar below to receive an explanation of the error.
EFW2 Error Codes
Error Codes
| Error Code | Explanation of Error |
|---|---|
| W3500 | The file you are trying to upload is too small to include a wage record or is empty. |
| W3510 | The document you are trying to upload is not in ".txt" format. Documents uploaded in other formats may be re-saved in ".txt" file format and then re-uploaded. |
| W3520 | The file size you are trying to upload is too large. The system is unable to upload a single file larger than 10MB. Try reducing the size by splitting data into multiple files. You can save and upload multiple files. |
| W3530 | The system is unable to upload the file. The system's security is compromised due to infected or unrepaired file. |
| W3540 | An unexpected error occurred during file upload. Please submit your request again. If you continue to receive this message, see "Troubleshooting MTO Error Messages" below. |
| W3550 | An unexpected error occurred during file upload. Please submit your request again. If you continue to receive this message, see "Troubleshooting MTO Error Messages" below. |
| W3560 | An unexpected error occurred during file upload. Please submit your request again. If you continue to receive this message, see "Troubleshooting MTO Error Messages" below. |
| W3570 | Unable to retrieve W2 records data. Please submit your request again. If you continue to receive this message, see "Troubleshooting MTO Error Messages" below. |
Troubleshooting MTO Error Messages
If you repeatedly receive an MTO error message, complete all of the following steps. Be sure to reattempt your MTO transaction after each step:
- Verify you are using an MTO supported web browser: Chrome, Edge, Firefox, Safari
- Log out of the MTO session and exit the browser completely
- Shutdown computer and restart
- Clear browser cache
- Switch web browsers and/or computers if possible
If you continue to receive the error message after completing the steps referenced above, please contact the Treasury Customer Service Center during normal business hours (Monday - Friday, 8:00 am - 4:30 pm EST):
- ESA: 517-241-0310
- Registration and SUW: 517-636-6925