Can't modify frozen String

Hi guys, I'm tring to execute rspec to run my tests and I'm getting a error

 Failure/Error: visit 'http://google.com.br'

 FrozenError:
   can't modify frozen String

Any ideas how to solve this issue?
I'm using ruby ruby 2.5.5
rspec 3.8.0
rspec-core 3.8.2