I can't upload contacts into mysurveylab

If you can't upload a list of contacts into mysurveylab, please check :

1. If your file does contain blank lines.
2. If your file contains special characters on the of each line or inside contacts.

If your file contains blank lines please delete them.

To do it you can use MS Excel :

1. Upload your file into the Excel.
2. Sort it.
3. Copy only lines with contacts.
4. Paste copied lines into a new text file.