Build Failed ( build.gradle)

Hello, after several modifications and addition on my mod including modifications in the workspace settings to change the versino of my mods and the credits, launch the game I have the following error:

Etag download for https://files.minecraftforge.net/maven/de/oceanlabs/mcp/versions.json f…
Etag download for http://export.mcpbot.bspk.rs/versions.json failed with code 400
FAILURE: Build failed with an exception.
* Where:
Build file 'D:\MCreator\WhiteForestMod\build.gradle' line: 10
* What went wrong:
A problem occurred evaluating root project 'WhiteForestMod'.
> Failed to apply plugin [id 'net.minecraftforge.gradle.forge']
   > java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 1 column 1
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
* Get more help at https://help.gradle.org
BUILD FAILED in 4s

Please help me