How to resolve adb server version doesnt match this client?

I am running into an issue when I kick off my android test cases I am getting an error telling me that my adb version does not match my client.

Ive start and stopped the adb server and that does not solve the issue.

Ive also ran “adb shell getprop” and it is returning “5.1.1”.

Any idea how to solve this issue?