Creating an NSX logical switch fails

While you are configuring NSX, after adding logical switches you may encounter with an error and also failure of NSX logical switch creation:

" Unable to allocate an available resource for resource type Segment Id Pool "

This problem has been occurred just because of not-configured Segment ID Pool for assigning to NSX objects. So you need only edit Segment ID settings and add a range of pool id for objects (or universal objects). Then you will see everything will be done and you can setup the logical switches of NSX