Compatibility Problem Between Eve-Mongoengine and Eve-Swagger

[abilinx]

The Eve-Swagger is a python library used to create swagger doc:
https://github.com/pyeve/eve-swagger

I had eve and eve-swagger working together fine. After I tried to install Eve-Mongoengine in my virtualenv, the eve-swagger produced an internal error when I tried to visit /api-docs endpoint. I've realized that there must be some version conflict between eve-swagger and Eve-Mongoengine that makes problems. It's output of eve when I tried to get /api-docs endpoint:
127.0.0.1 - - [28/Aug/2017 10:31:46] "GET /api-docs HTTP/1.1" 500 -
I tried eve in DEBUG mode and got nothing.

It's is my requirements.txt file before installing Eve-Mongoengine that was fine:
Cerberus==0.9.2
click==6.7
Eve==0.7.4
Eve-Swagger==0.0.7
Events==0.2.2
Flask==0.12
Flask-PyMongo==0.5.1
itsdangerous==0.24
Jinja2==2.9.6
MarkupSafe==0.23
pymongo==3.5.0
simplejson==3.11.1
Werkzeug==0.11.15

This is my requirements.txt after installing Eve-Mongoengine that makes /api-docs unavailable:
blinker==1.4
Cerberus==0.7.2
click==6.7
Eve==0.4
Eve-Mongoengine==0.0.9
Eve-Swagger==0.0.7
Events==0.2.1
Flask==0.10.1
Flask-PyMongo==0.3.0
itsdangerous==0.24
Jinja2==2.7.3
MarkupSafe==0.23
mongoengine==0.13.0
pymongo==2.7.1
simplejson==3.5.2
six==1.10.0
Werkzeug==0.9.6

I already filed this issue in eve-swagger git project:
pyeve/eve-swagger#50