I'm following a modding tutorial (for 1.14) for my first time modding and I can't figure out why this is happening. I made a RunClient.bat as instructed in the tutorial, and it's contents are "gradlew runClient" (no quotes). It seems to start working, because it opens a Minecraft window, but then it crashes after a second and the console window closes too. To capture the console, I just ran the "gradlew runClient" command in a console window rather than using the bat file. Here's the bit at the end of the console:

> Task :runClient FAILED

 

FAILURE: Build failed with an exception.

 

* What went wrong:

Execution failed for task ':runClient'.

> Process 'command 'C:\Program Files\Java\jre1.8.0_221\bin\java.exe'' finished with non-zero exit value -1

 

The rest is on this pastebin: https://pastebin.com/MVzsB5hJ

 

Any help finding out what's going wrong would be appreciated.

Forgive me, as I am no expert. But my solution was to check my mods.toml
Make sure every field is filled out. Including the #optional ones and  the "URL" ones.

For instance,

 

 

PS: http://example.com/ is an actual working URL you can use as a 'filler'