Problem: The ActiveShade window displays a message "error: Could not obtain a license (-98)".
Cause: This error means that, while V-Ray RT successfully connected to the V-Ray license server, there are no licenses for V-Ray RT on it:
You may be using an older version of the V-Ray license server that does not support V-Ray RT licenses;
You may not have any licenses for V-Ray RT on the dongle attached to the machine where the license server is running.
Solution: To resolve this please try installing the latest V-Ray License Server.