GEVENT error even for imports

[Rahul]

Hi All,

     I am getting gevent error even only when doing import on production linux machine (Debian 9.5) .  I am trying to register a new user and I use recaptcha2 for that.

File "/home/www-data/web2py/applications/application/controllers/default.py", line 4222, in register
if form.accepts(request.vars, session):

<class 'gevent.exceptions.LoopExit'> This operation would block forever Hub: <Hub '' at 0x7f9f6ca157e0 epoll default pending=0 ref=0 fileno=16 resolver=<gevent.resolver_thread.Resolver at 0x7f9f68a9b590 pool=<ThreadPool at 0x7f9f68abe790 1/1/10 hub=<Hub at 0x7f9f6ca157e0 thread_ident=0x140323193978944>>> threadpool=<ThreadPool at 0x7f9f68abe790 1/1/10 hub=<Hub at 0x7f9f6ca157e0 thread_ident=0x140323193978944>> thread_ident=0x7f9f8a218040> Handles: []

Any clue ?

Rahul