Modern Metals 1.12.1 #110 has failed

Build 'Modern Metals 1.12.1' is failing!
Last 50 lines of build output:
[...truncated 8.79 KB...]
:deobfCompileRemapDepSourcesTask13 SKIPPED
:deobfCompileRemapDepSourcesTask14 SKIPPED
:deobfCompileRemapDepSourcesTask15 SKIPPED
:deobfCompileRemapDepSourcesTask8 SKIPPED
:deobfCompileRemapDepSourcesTask9
:deobfCompileDummyTask
:getVersionJson
:extractUserdev UP-TO-DATE
:downloadClient SKIPPED
:downloadServer SKIPPED
:splitServerJar SKIPPED
:mergeJars SKIPPED
:applyBinaryPatches SKIPPED
:deobfProvidedDummyTask
:extractDependencyATs SKIPPED
:extractMcpData SKIPPED
:genSrgs SKIPPED
:deobfMcMCP SKIPPED
:setupCiWorkspace
:clean
:sourceApiJava
:compileApiJava NO-SOURCE
:processApiResources NO-SOURCE
:apiClasses UP-TO-DATE
:sourceMainJava
:compileJava/var/lib/jenkins/workspace/Modern Metals 1.12.1/build/sources/main/java/com/mcmoddev/modernmetals/init/Items.java:134: error: incompatible types: ItemStack cannot be converted to Item
            for (Item item : material.getItems()) {
                                              ^
1 error
 FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':compileJava'.
> Compilation failed; see the compiler error output for details.

* 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 2m 9s
11 actionable tasks: 10 executed, 1 up-to-date
Build step 'Invoke Gradle script' changed build result to FAILURE
Build step 'Invoke Gradle script' marked build as failure
Archiving artifacts
[Set GitHub commit status (universal)] FAILURE on repos [GHRepository@477e661c[description=Modern Metals Mod,homepage=,name=ModernMetals,license=<null>,fork=false,size=30785,milestones={},language=Java,commits={},source=<null>,parent=<null>,responseHeaderFields={null=[HTTP/1.1 200 OK], Access-Control-Allow-Origin=[*], Access-Control-Expose-Headers=[ETag, Link, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval], Cache-Control=[private, max-age=60, s-maxage=60], Content-Encoding=[gzip], Content-Security-Policy=[default-src 'none'], Content-Type=[application/octet-stream], Date=[Fri, 02 Mar 2018 09:12:44 GMT], ETag=["829d949698761c3eae06196d0f4544e8"], Last-Modified=[Tue, 31 Oct 2017 10:22:00 GMT], OkHttp-Received-Millis=[1519981965045], OkHttp-Response-Source=[CONDITIONAL_CACHE 304], OkHttp-Selected-Protocol=[http/1.1], OkHttp-Sent-Millis=[1519981964863], Server=[GitHub.com], Status=[304 Not Modified], Strict-Transport-Security=[max-age=31536000; includeSubdomains; preload], Transfer-Encoding=[chunked], Vary=[Accept, Authorization, Cookie, X-GitHub-OTP], X-Accepted-OAuth-Scopes=[repo], X-Content-Type-Options=[nosniff], X-Frame-Options=[deny], X-GitHub-Media-Type=[github.v3; format=json], X-GitHub-Request-Id=[909B:2F945:AA5217:180795D:5A99158C], X-OAuth-Scopes=[admin:gpg_key, admin:org, admin:org_hook, admin:public_key, admin:repo_hook, gist, notifications, repo, user], X-RateLimit-Limit=[5000], X-RateLimit-Remaining=[4992], X-RateLimit-Reset=[1519985421], X-Runtime-rack=[0.077319], X-XSS-Protection=[1; mode=block]},url=https://api.github.com/repos/MinecraftModDevelopmentMods/ModernMetals,id=55920862]] (sha:6e5a084) with context:Modern Metals 1.12.1
Setting commit status on GitHub for https://github.com/MinecraftModDevelopmentMods/ModernMetals/commit/6e5a084fe0a4f87589d4a1c96a9d7037c651f253
Changes since last successful build: No changes
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MinecraftModDevelopmentMods / ModernMetals

Modern Metals 1.12.1 #110 has failed #94
