Hard to say. Fix your batch files. Likely the error is telling you exactly what is happening.
As part of update action, I am trying to stop a service (using the already available feature of Wybuild and not using any .bat files) . Service with given name do exists in the machine but , Wybuild is failing to update and throwing an error says "Update Failed - Service xxx was not found on computer '.'."
Please help.
Hard to say. Fix your batch files. Likely the error is telling you exactly what is happening.