I got this error while trying to decompile MCP version 1.8.8
my source version is 1.6
my target version is 1.6
== MCP 9.18 (data: 9.18, client: 1.8.8, server: 1.8.8) ==
...
== Decompiling client using fernflower ==
...
> Applying patches
'runtime\bin\applydiff.exe -p1 -u -i ..\..\temp\temp.patch -d src\minecraft' failed : 1
== ERRORS FOUND ==
1 out of 1 hunk FAILED -- saving rejects to file 'net\minecraft\util\Cartesian.jav#'
==================
...
== ERRORS FOUND in JAVA CODE ==
error: Source option 6 is no longer supported. Use 7 or later.
error: Target option 6 is no longer supported. Use 7 or later.
==================
thanks!
Java 1.6 is not Supported for MCP 918 (1.8.8), Try installing Java 8 from this link:https://adoptopenjdk.net/?variant=openjdk8&jvmVariant=hotspot