I start mcreator and few seconds after it stops .

Status
Fixed
Issue description

I coppied error . Here it is :   
Executing gradle command: wrapper --gradle-version 4.4
Build info: MCreator 1.8.2, 64-bit, 3669 MB, Windows 10 - cmd, JVM 1.8.0_192, JAVA_HOME: C:\Pylo\MCreator182\.\jdk
(c) 2018 Microsoft Corporation. Vçetky pr va vyhraden‚.
C:\Pylo\MCreator182\forge>gradlew -Dorg.gradle.daemon=false -Dorg.gradle.parallel=false -Dorg.gradle.jvmargs="-Xms625m -Xmx2048m" wrapper --gradle-version 4.4
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 'C:\Pylo\MCreator182\forge\build.gradle' line: 10
* What went wrong:
A problem occurred evaluating root project 'forge'.
> 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.
BUILD FAILED
Total time: 37.611 secs
C:\Pylo\MCreator182\forge>
Task completed with return code 0 in 43839 milliseconds

Issue comments

In most cases, this is caused if MCreator is not able to access the internet. Make sure you don't have firewalls or antiviruses blocking MCreator, uninstall it and install again.

If the error persists, wait a bit as Minecraft Forge servers might be overloaded at the moment and then reinstall again.

I don't have other ideas what to do as this error has to do with something blocking MCreator in most cases. I suggest you search a bit on our website for Expected BEGIN_OBJECT but was STRING at line 1 column 1 as many users had this error and fixed it and you might find their solutions useful as a guide on what else to do/try.