Error: not found; no service started

Sometimes it’s a headache to report an error. If you have a problem with your own code, you can still solve it. However, if there is a problem with the as tool, it’s embarrassing!
I’ve heard that as2.3 has its own bug before, but I haven’t encountered it. Fortunately, I did today! All kinds of search information, over the wall!
The error is as follows:

Starting service: Intent 
{ act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] 
cmp=com.xxx.xxx.constrain/com.android.tools.fd.runtime.InstantRunService }
Error: Not found; no service started.

Solution:
first, simply and crudely re install as2.3 (I use version 2.3)
Second, upgrade as in the case of upgrade. At present, my as is upgraded from 2.3 to 2.3.1
and above, and all the problems can be solved


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