Workspace is not connecting


hi, I have two workspaces on cloud9 in node.js. 2 days ago, they are working normally but now they continue spinning without any progress. I have checked vpc setting also but not help.
I also try creating a new one and it also stuck there. i checked my both environment setting, there is no subnet added on there.
i’m wondering if that’s the issue why second one is not working.

if subnet is issue, please help me, how to add subnet to cloud9 environment