[MC-188671] cant launch game with mods

every time I try to launch Minecraft this pops up: an unexpected error occurred sorry for the inconvenience.

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You are using a modified version of the game. This site only supports bugs in a vanilla environment.

Thank you for your report!
However, this issue is Invalid.

Your game, launcher or server is modified.
If you can reproduce the issue in a vanilla environment, please create a new ticket.

Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.
Any plugin issues need to be addressed to the creator of the plugin or resource pack.
If you have problems on large servers, such as The Hive and Hypixel, please contact them first as they run modified server software.

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I play modded Minecraft this happens all the time

1. is all the mods updated to the version you are playing on?

2. Some mods just don't work anymore and crash upon starting up the game.

3. Some mods have cores that help the mods run for example CodeChickenCore for Not Enough Items

Report bugs with mods to the people who created the mods. They have nothing to do with Mojang.