OK, I assume you have used AI2 before or is this your first attempt at AI2 programming?
Can you tell us what happens when you try to connect? Are you using Projects > Emulator.
You are aware that a new version nr140 was uploaded last night and that the new version requires an new Companion? Do you have Companion 2.24 installed?
Are you trying to load a previous large project? Many connection errors are due to issues in coding or exceeding developent parameters (an aia larger than 5MB; more than 10 screen etc. which may inhibit the emulator from connecting).
Best guess is that you need to get Companion 2.24 on your system... Projects>Hard Reset ; then follow the pop up instructions. Did that work?
Regards,
Steve