Full Log: https://paste.link/p2/HM8bTuQhICrq0fSUGExXBw.txt

[04Feb2020 17:32:10.744] [modloading-worker-3/ERROR] [net.minecraftforge.fml.javafmlmod.FMLModContainer/LOADING]: Failed to create mod instance. ModID: universalmodcore, class cam72cam.mod.ModCore
java.lang.IllegalAccessError: no such constructor: cam72cam.immersiverailroading.tile.TileRailGag.()void/newInvokeSpecial
at java.lang.invoke.MethodHandleNatives.linkMethodHandleConstant(MethodHandleNatives.java:483) ~[?:1.8.0_51]
at cam72cam.immersiverailroading.blocks.BlockRailGag.(BlockRailGag.java:9) ~[?:1.7.2_1.14.4]
at cam72cam.immersiverailroading.IRBlocks.(IRBlocks.java:10) ~[?:1.7.2_1.14.4]
at cam72cam.immersiverailroading.ImmersiveRailroading.commonEvent(ImmersiveRailroading.java:91) ~[?:1.7.2_1.14.4]
at cam72cam.mod.ModCore$Proxy.lambda$event$0(ModCore.java:139) ~[?:1.7.2_1.14.4]
at cam72cam.mod.ModCore$Proxy$$Lambda$3150/546603672.accept(Unknown Source) ~[?:?]
at java.util.ArrayList.forEach(ArrayList.java:1249) ~[?:1.8.0_51]
at cam72cam.mod.ModCore$Proxy.event(ModCore.java:139) ~[?:1.7.2_1.14.4]
at cam72cam.mod.ModCore$ClientProxy.event(ModCore.java:145) ~[?:1.7.2_1.14.4]
at cam72cam.mod.ModCore.(ModCore.java:72) ~[?:1.7.2_1.14.4]
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_51]
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:1.8.0_51]
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_51]
at java.lang.reflect.Constructor.newInstance(Constructor.java:422) ~[?:1.8.0_51]
at java.lang.Class.newInstance(Class.java:442) ~[?:1.8.0_51]
at net.minecraftforge.fml.javafmlmod.FMLModContainer.constructMod(FMLModContainer.java:131) [?:28.1]
at net.minecraftforge.fml.javafmlmod.FMLModContainer$$Lambda$2144/1032600842.accept(Unknown Source) [?:28.1]
at java.util.function.Consumer.lambda$andThen$14(Consumer.java:65) [?:1.8.0_51]
at java.util.function.Consumer$$Lambda$2143/671515431.accept(Unknown Source) [?:1.8.0_51]
at java.util.function.Consumer.lambda$andThen$14(Consumer.java:65) [?:1.8.0_51]
at java.util.function.Consumer$$Lambda$2143/671515431.accept(Unknown Source) [?:1.8.0_51]
at net.minecraftforge.fml.ModContainer.transitionState(ModContainer.java:112) [?:?]
at net.minecraftforge.fml.ModList.lambda$null$10(ModList.java:134) [?:?]
at net.minecraftforge.fml.ModList$$Lambda$2448/1008503329.accept(Unknown Source) [?:?]
at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184) [?:1.8.0_51]
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1374) [?:1.8.0_51]
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:512) [?:1.8.0_51]
at java.util.stream.ForEachOps$ForEachTask.compute(ForEachOps.java:291) [?:1.8.0_51]
at java.util.concurrent.CountedCompleter.exec(CountedCompleter.java:731) [?:1.8.0_51]
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289) [?:1.8.0_51]
at java.util.concurrent.ForkJoinPool$WorkQueue.execLocalTasks(ForkJoinPool.java:1040) [?:1.8.0_51]
at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1058) [?:1.8.0_51]
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1689) [?:1.8.0_51]
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157) [?:1.8.0_51]
Caused by: java.lang.NoClassDefFoundError: trackapi/lib/ITrack
at java.lang.invoke.MethodHandleNatives.resolve(Native Method) ~[?:1.8.0_51]
at java.lang.invoke.MemberName$Factory.resolve(MemberName.java:962) ~[?:1.8.0_51]
at java.lang.invoke.MemberName$Factory.resolveOrFail(MemberName.java:987) ~[?:1.8.0_51]
at java.lang.invoke.MethodHandles$Lookup.resolveOrFail(MethodHandles.java:1390) ~[?:1.8.0_51]
at java.lang.invoke.MethodHandles$Lookup.linkMethodHandleConstant(MethodHandles.java:1746) ~[?:1.8.0_51]
at java.lang.invoke.MethodHandleNatives.linkMethodHandleConstant(MethodHandleNatives.java:477) ~[?:1.8.0_51]
... 33 more
Caused by: java.lang.ClassNotFoundException: trackapi.lib.ITrack
at java.lang.ClassLoader.findClass(ClassLoader.java:530) ~[?:1.8.0_51]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_51]
at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:103) ~[modlauncher-4.1.0.jar:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_51]
at java.lang.invoke.MethodHandleNatives.resolve(Native Method) ~[?:1.8.0_51]
at java.lang.invoke.MemberName$Factory.resolve(MemberName.java:962) ~[?:1.8.0_51]
at java.lang.invoke.MemberName$Factory.resolveOrFail(MemberName.java:987) ~[?:1.8.0_51]
at java.lang.invoke.MethodHandles$Lookup.resolveOrFail(MethodHandles.java:1390) ~[?:1.8.0_51]
at java.lang.invoke.MethodHandles$Lookup.linkMethodHandleConstant(MethodHandles.java:1746) ~[?:1.8.0_51]
at java.lang.invoke.MethodHandleNatives.linkMethodHandleConstant(MethodHandleNatives.java:477) ~[?:1.8.0_51]
... 33 more

You need to add the TrackAPI mod