DavidM

Don't use cracked launchers. Buy the game.

Do not make custom installers. All the user has to do is to drag the mods into the mods folder. There is no need for an installer for such a simple task. Custom installers are potentially reshipping mods in addition to security problems.

1.7.10 is no longer supported on this forum due to its age. Update to a modern version of Minecraft to receive support.

Post log.

1.12.2 is no longer supported on this forum. Update to a modern version of Minecraft to receive support.

Please read the EAQ and provide the debug.log. We cannot help you without the log.

Add velocity also need to be done on client side to provide smooth movement.

java -jar <file_name>

Please post a screenshot of your versions drop down list.

You need to create a new launcher profile and set the version of the profile to forge-1.15.

Try running the file via command-line.

You will have to do this every time you want to launch the server.

Running the first one would start a vanilla server. Try running the second one from command line via java -jar <file_name> . Remember to cd into the directory first.

The new log does not indicate the previous error. 1. Don’t use a random third-party tool to delete a directory. Either use the file browser or a command-line to do so. 2. How did you delete the folder? Judging from the screenshot you might have “unlocked” the directory instead of deleting it. 3. What launcher are you using currently?

It sounds like you are starting a vanilla server. How are you starting the server?