Clean fails HELP

Status
Fixed
Issue description

Hi, When I want to start client Test environment, .clean always fails, help?, It ALWAYS DO THAT, Please help me!

Executing gradle command: clean runClient
Build info: MCreator 1.8.0, 64-bit, 8061 MB, Windows 10, JVM 1.8.0_172
C:\Pylo\MCreator180\forge>gradlew -Dorg.gradle.daemon=false -Dorg.gradle.parallel=false -Dorg.gradle.jvmargs="-Xms625m -Xmx2048m" clean runClient 
This mapping 'snapshot_20171003' was designed for MC 1.12! Use at your own peril.
#################################################
         ForgeGradle 2.3-SNAPSHOT-ee3e3df        
  https://github.com/MinecraftForge/ForgeGradle  
#################################################
                 Powered by MCP                  
             http://modcoderpack.com             
     by: Searge, ProfMobius, R4wk, ZeuX          
     Fesh0r, IngisKahn, bspkrs, LexManos         
#################################################
:clean FAILED
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':clean'.
> Unable to delete file: C:\Pylo\MCreator180\forge\build\retromapping\replacedMain.rangemap
* 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: 44.195 secs
C:\Pylo\MCreator180\forge>
Task completed with return code 0 in 46184 milliseconds

Issue comments

Try to manually delete C:\Pylo\MCreator180\forge\build\retromapping\replacedMain.rangemap, then restart your computer and MCreator should start working.