problem with :recompileMc while setting up project

[EnderPoint07]

Setting editor to eclipse
Ran gradlew command: gradlew setupDecompWorkspace eclipse
This mapping 'stable_20' was designed for MC 1.8.8! Use at your own peril.
WARNING: You are using an unsupported version of ForgeGradle.
Please consider upgrading to ForgeGradle 5 and helping in the efforts to get old versions working on the modern toolchain.
See https://gist.github.com/TheCurle/fe7ad3ede188cbdd15c235cc75d52d4a for more info on contributing.
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ForgeGradle 2.1.3-g6a7c715
https://github.com/MinecraftForge/ForgeGradle
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Powered by MCP unknown
http://modcoderpack.com
by: Searge, ProfMobius, Fesh0r,
R4wk, ZeuX, IngisKahn, bspkrs
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:deobfCompileDummyTask
:deobfProvidedDummyTask
:getVersionJson
:extractUserdev
:extractDependencyATs SKIPPED
:extractMcpData SKIPPED
:extractMcpMappings SKIPPED
:genSrgs SKIPPED
:downloadClient SKIPPED
:downloadServer SKIPPED
:splitServerJar SKIPPED
:mergeJars SKIPPED
:deobfMcSRG SKIPPED
:decompileMc SKIPPED
:fixMcSources SKIPPED
:applySourcePatches
:remapMcSources SKIPPED
:recompileMc FAILED

BUILD FAILED

Total time: 15.089 secs