Error 500 in "Project Manager"

Steps to reproduce: Press "Project Manager" with running server
In URL: "http://localhost:6687/project/" i get:
500: Internal Server Error

Trace:
——————————————————————-
ERROR:tornado.application:Uncaught exception GET /project/ (::1)
HTTPServerRequest(protocol='http', host='localhost:6687', method='GET', uri='/project/', version='HTTP/1.1', remote_ip='::1', headers={'Connection': 'keep-alive', 'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.21 (KHTML, like Gecko) konqueror/4.14.2 Safari/537.21', 'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8', 'Host': 'localhost:6687', 'Accept-Charset': 'utf-8,*;q=0.5', 'Accept-Language': 'en-US,en;q=0.9', 'Referer': 'http://localhost:6687/', 'Accept-Encoding': 'gzip, deflate, x-gzip, x-deflate'})
Traceback (most recent call last):
File "/home/wintch/work/blend4web_sdk_free/addons/blend4web/lib/tornado/web.py", line 1345, in _execute
result = method(*self.path_args, **self.path_kwargs)
File "/home/wintch/work/blend4web_sdk_free/addons/blend4web/server.py", line 560, in get
projects = self.get_proj_list(root, False)
File "/home/wintch/work/blend4web_sdk_free/addons/blend4web/server.py", line 470, in get_proj_list
path = s.split("->")[1].strip(" ")
IndexError: list index out of range
ERROR:tornado.access:500 GET /project/ (::1) 133.00ms
——————————————————————-

Seems to be a Linux only issue. Tried on Windows 7, all fine. On another Linux machine, (which runs Debian 8) i get same error:

ERROR:tornado.application:Uncaught exception GET /project/ (::1)
HTTPServerRequest(protocol='http', host='localhost:6687', method='GET', uri='/project/', version='HTTP/1.1', remote_ip='::1', headers={'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.109 Safari/537.36', 'Accept-Language': 'es-419,es;q=0.8,en-US;q=0.6,en;q=0.4,ru;q=0.2', 'Upgrade-Insecure-Requests': '1', 'Connection': 'keep-alive', 'Host': 'localhost:6687', 'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8', 'Cache-Control': 'max-age=0', 'Accept-Encoding': 'gzip, deflate, sdch'})
Traceback (most recent call last):
File "/mnt/rojo/SinBack/DevLiveProgs/blend4web_sdk_free/addons/blend4web/lib/tornado/web.py", line 1345, in _execute
result = method(*self.path_args, **self.path_kwargs)
File "/mnt/rojo/SinBack/DevLiveProgs/blend4web_sdk_free/addons/blend4web/server.py", line 560, in get
projects = self.get_proj_list(root, False)
File "/mnt/rojo/SinBack/DevLiveProgs/blend4web_sdk_free/addons/blend4web/server.py", line 470, in get_proj_list
path = s.split("->")[1].strip(" ")
IndexError: list index out of range
ERROR:tornado.access:500 GET /project/ (::1) 1882.56ms

Thanks!

Ok, it's working now.
On server.py file, line 468 there is a for:
"for s in proj_strs:"

For some reason inside "s" variable it's a string "Couldn't find Java", that drives to an error in s.split later inside same for.
After installing JRE problem is gone, but i couldn't find a mention of JRE being a requirement for SDK.
So please mention JRE under System Requirements on web and/or readme file