Unable to run Python Selenium WebDriver automation script using Geckodriver 0.21.0 and Firefox 60.1.0esr (64-bit) for CentOS Linux redhat – 1.0

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Unable to run Python Selenium WebDriver automation script using Geckodriver 0.21.0 and Firefox 60.1.0esr (64-bit) for CentOS Linux redhat – 1.0
Its opening the Firefox browser but scripts are not able to enter required URL.
Always it's throwing this error message:
SessionNotCreatedException: Message: Tried to run command without establishing a connection
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This question is rather brief, and readers will likely need an Minimal, Complete, and Verifiable example to be able to help you. Would you be able to edit your question to show one?
– halfer
4 mins ago