Hi,
Firstly, did you configure the Event Dest in the IDM? This message appears if you have not.
Secondly, the error message you are receiving, related to a discrepancy in version, is usually due to the fact that IDS sensors and the IEV are not on the same version. Please check your versions and try to add the sensor again.
Also, if you have the wrong IP of the IEV Viewer in the sensor, this error message will appear.