Test Cases of Robot Framework are getting failed on server giving error "TypeError: get_request() got an unexpected keyword argument"

I have a project in java and tests scripts are written on robot.I want to run my test scripts on server, where I have a war(after building)file of my project. When I am running my tests Scripts on local system it working, but When I run my test scripts on server, some tests are getting passed and some are getting failed. My server is Ubuntu 14.04.

I am using the following command to run test scripts on server: pybot -v env:dev /var/lib/jenkins/jobs/AnATest/tests/

where env:dev is just environment name and /var/lib/jenkins/jobs/AnATest/tests/ is my directory where all robot tests files are residing. Please tell me, if more information is required.