I have the feel there erj and I can't give all the coms to Otto he has the radio but not the nav. Also I have to do the flying it says he has it but I still have to fly the plane is there any solutions to this it work good with the other planes

Radar Contact can only control aircraft that use the default FS autopilot. If the ERJ has its own a/p you can still use RC but need to load a plan with the same waypoints into your ERJ. Does it have an FMC that accepts a flight plan?

Yes it excepts the flight plan that I build but I build it with fsnav

Yes it excepts the flight plan that I build but I build it with fsnav

It doesn't matter what you use to build the plan as long as you feed the same one to RC as to your ERJ a/p. Is that what you are doing?

The plan in the erj fmc is the same one as RC I use fsnav and export it to FS and load it into RCA and fmc

Okay so all you need to do is engage the a/p and it will fly the route. Don't hand control to Otto as he can't handle the a/p despite any announcement to the contrary.