This error occurs when there is no survey link added to the email invite. By default, the compose section of the email includes the survey link which is represented by the text ‘’ and it acts as a tracked link (screenshot: https://prnt.sc/AjLbwIObs-ak).
In case you have edited the email invite and the survey link is removed, then you can add it back by clicking on the ‘Insert Survey Link’ icon (check the above-shared screenshot). There are 2 kinds of links:
Tracked Respondents - It is represented by the text ‘‘, the system will track the respondent’s details if this link is added to the email invite.
Anonymous Respondents - It is represented by the text ‘’, the system will not track the respondent’s details if this link is added to the email invite.
To know more, please check the help file: https://www.questionpro.com/help/tracking-respondents.html