generator maps & bugs mc

Thank you for your report!
However, we do not have enough information to find the cause of this issue.
Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report ([minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/guides/finding-minecraft-data-folder/]) here.

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@violine1101 Added crash log

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 recreate the issue.

– 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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ok please wait

The movie is too long so i attach a link to yt https://youtu.be/7sdoX3Vv9K0
Once worked and once not created portal

One issue per ticket. Please read the issue guidelines.

The server you're using is modded → invalid.

Also, you're not building the end portal correctly. All the portal frames have to be placed from inside the end portal, so they all 'look' towards the middle. Read the wiki page about this.

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📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki

I watched tutorials on the internet and it does not work for me

End portals blocks have a front, which must face inward if you are to build a working End Portal.