Learn Baidu SDK encountered problem 200 code solution

When learning the status of Baidu SDK service, the first positioning no problem
And GPS positioning is normal, but as long as the network location updates, it will appear
Exception coordinates, looked at for a long time code and developer documentation has not found a problem
Read the next error code
{"Status": $, "message": "App does not exist"}
I don't know what the reason is.
Finally found that the AK key copy when there is a space , resulting in a second read failure
So, the problem of encountering 200 code first check the AK key, I hope not someone like me for this distressed half day