I do not keep green tree frogs.
However , I will try to get things going.
If you could ( cut and paste) answer the questions in the link below it will really help.

What is the humidity level ? Very important

http://www.frogforum.net/tree-frogs/...enclosure.html

It is likely you will have to change the substrate to "tropical soil" as I don't think the tree bark is appropriate--- it can cause impaction if it is ingested.