| Code | Meaning | Possible causes | Suggested solutions | Notes |
| Error001 | File not found | 1) parameter fileName is empty 2) Name of file provided in parameter fileName is wrong. | ||
| Error002 | Wrong field mapping | 1) header row of file is wrong 2) header row of file isn't present | Check header row of transferred file | |
| Error003 | Impossible open file | 1) Name of file provided in parameter fileName is wrong. 2) File hasn't be transferred to MailUp via FTP. 3) FTP transferring of the file to MailUp isn’t completed | 1) Check value provided to parameter fileName. 2) Verify FTP file transferring . | |
| Error004 | Generic error during reading of recipients | System problem | Contact us | |
| Error005 | Generic error during import of recipients | System problem | Contact us | |
| Error006 | Generic error during sending of message | System problem | Contact us | |
| Warn001 | Schedule date not available | Schedule date provided in parameter timeDateSending overlap to an already scheduled message sending in MailUp console | You can schedule message send using MailUp console. | Import to MailUp of the recipients included in the file has been completed and message is ready to be sent. |
| Warn002 | Problem during sending schedule | System problem | You can schedule message send using MailUp console. | Import to MailUp of the recipients included in the file has been completed and message is ready to be sent. |
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