C2W3 Assignment 3: Cloud9 provisioning fails

The assignment environment starts very quickly, but creating Cloud9 environment takes unreasonably long time and then fails. Can someone look into this please? Thanks in advance!
Here is the error message from the Vpc details:

Hello @sgeletta
Please, make sure that you are choosing all the right settings for your Cloud9 environment. Changing even one of the leads to a failure in the instant creation.