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Rahul Raghunathan 22Rahul Raghunathan 22 

Getting error while doing the Travis CI trail Head.

Currently when I am doing the following the TrailHead I am getting stuck at a point. I perform the exact steps as the trail head. when I type the below command:
travis encrypt-file assets/server.key assets/server.key.enc --add
I get the below error 
undefined method `each_pair' for #<String:0x0000000003696c68>
Did you mean?  each_char
for a full error report, run travis report -e "https://travis-ci.org/api"

any help would be appreciated
Below is the link to the trail head
https://trailhead.salesforce.com/modules/sfdx_travis_ci