ADB Server Error

Hi,

When I attempt to run a program, I get the following errror:-

ADB server didn't ACK
* failed to start daemon *
error: unknown host service

I have re-installed the SDK, no luck.

I connect to my device via Wi-Fi using B4A-Bridge.

What else can I try. This has cropped up suddenly. All was well a few days ago.

Please help.
Thanks