You run rvm use 2.7.0 but get the error: RVM is not a function, selecting rubies with 'rvm use ...' will not work.

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Ruby - Ecosystem and Best Practices

You run rvm use 2.7.0 but get the error: RVM is not a function, selecting rubies with 'rvm use ...' will not work.
What is the most likely cause?

ARVM is not installed

BYou did not load RVM as a shell function

CRuby 2.7.0 is not installed

DYou need to restart your computer

Step-by-Step Solution

Solution:

Step 1: Understand the error message
The error says 'RVM is not a function', which means the shell does not recognize RVM commands properly.
Step 2: Identify cause
This usually happens if the RVM script is not sourced in the shell, so RVM commands are not loaded as functions.
Final Answer:
You did not load RVM as a shell function -> Option B
Quick Check:
Load RVM script in shell to fix 'not a function' error [OK]

Quick Trick: Always source RVM script in your shell config [OK]

Common Mistakes:

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