error message i keep getting plus saved emails seems to be missing

error uploading item to folder ‘’ failed due to the following error: execution of request failed; ([line10,column 31,element gd:email/@address is required)

help—no response so far?  message appears everytime I open EmClient.  I do not get an error message or issues when I open email in gmail.  However I like the EMclient program.  I also have a laptop with my email on it using  EM client  and there is no error message on it.   As a possible solution can I delete the referenced file above in my error message and copy in the contacts file from my laptop?