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Nayanjyoti BaishyaNayanjyoti Baishya 

Executing the 'country' method on 'ParkLocator' failed. Make sure the method exists with the name 'country', is public and static, accepts a String, and returns an array of Strings from the web service.

I am getting this error in my trailhead Integration service.
SwethaSwetha (Salesforce Developers) 
HI Nayanjyoti,

We have a separate Trailhead team who can help you with these issues. Please use the below link to reach out to them so that one of the Engineers will get in touch with you.
Support: https://trailhead.salesforce.com/en/help?support=home

Please mark this answer as best if it helps so that others facing same issue will find it useful.Thanks