These players do not have the same game version in League of Legends is a bug that some users have been running into. The error usually occurs when one user is on a Mac and the other on a PC, but there is a relatively easy fix for it.
Here is how to fix the bug to get you back up and running on League of Legends.
These Players Do Not Have the Same Game Version League of Legends: How to Fix
To fix the error, try closing the client. Check to see if there is an update waiting to be installed. It might be a small update, but you want to be sure each of your games are up to date and running on the same version. Once your game or your friends game has successfully updated, restart your computers, open the client again, and try queuing together.
If you are still encountering the error, try validating your game files. Initiate a full repair by first clicking on the gear icon in the top right of the launcher and then clicking on the Initiate Full Repair button under Troubleshooting. If you are still receiving the error message, it is time to delete your game and reinstall it.