Re: Encountered an improper argument
I am also seeing this message on two different computers (both Windows XP). As vaughatg mentions the message appears when attempting to assign motors in the motors and sensors setup.
If I select Cortex as the platform type I don't get the message. I only get the message when the platform type is set to PIC.
I doesn't appear to create any issues compiling or using the PIC. Just seems to be a nuisance message.