We are not able to reproduce this issue on our side. It will be very helpful if you could prove us with additional information, any steps to reproduce or video of reproducing the problem? Also, on which screen do you receive this error? Which version of TeamPulse do you use?
Log files will also be helpful for investigating this issue. They are usually located in C:\Program Files (x86)\Telerik\TeamPulse\Logs
Looking forward for your response.