I Can't Add New Monitor MongoDB into AM

I Can't Add New Monitor MongoDB into AM

Dear all,
I have a senario bellow, i can't add more mongodb into my system with error show " The monitor already exists"

Step 1: i add new monitor MONGODB sussecess with name: XXXX
step 2: i delete it for some reason
step 3: i add again New monitor MongoDB with the same name or diff name ( the both not success)
--> I check mongodb don't see any item monitor, but i can not add it.
Please help me by case






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