Unknown property or method: 'wait_for_string'

[Saikruby]

I am running ruby script(using te3270~ 0.8.1) via terminal on windows aws instance "windows server 2012/2008 R2" but facing error i.e "unknown property or method: 'Wait' HRESULT error code: 0x8002006 Unknown name.(NoMethodError)"

Where as same script is working on my local windows machine. Note: Ruby version,devkit, gems, ruby code & mode of execution is same in both pc's.

Please help me out in resolving above issue.