fabric: 1.14.1
cotton: cotton-0.6.7+1.14.1-SNAPSHOT

Exception in thread "Client thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at net.fabricmc.loader.game.MinecraftGameProvider.launch(MinecraftGameProvider.java:172)
at net.fabricmc.loader.launch.knot.Knot.init(Knot.java:127)
at net.fabricmc.loader.launch.knot.KnotClient.main(KnotClient.java:26)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at net.fabricmc.loader.game.MinecraftGameProvider.launch(MinecraftGameProvider.java:170)
... 2 more
Caused by: java.lang.NoClassDefFoundError: net/minecraft/item/ItemStack
at io.github.cottonmc.cotton.config.ConfigManager.getBaseJankson(ConfigManager.java:22)
at io.github.cottonmc.cotton.config.ConfigManager.loadConfig(ConfigManager.java:52)
at io.github.cottonmc.cotton.config.ConfigManager.loadConfig(ConfigManager.java:48)
at io.github.cottonmc.resources.CottonResources.(CottonResources.java:14)
at net.minecraft.class_3864.handler$mixinDefaultOres$zmo000(class_3864.java:517)
at net.minecraft.class_3864.method_17006(class_3864.java)
at net.minecraft.class_2075.(class_2075.java:43)
at net.minecraft.class_1972.(class_1972.java:9)
at net.minecraft.class_2378.method_10242(class_2378.java:86)
at net.minecraft.class_2378$$Lambda$97/1013620810.get(Unknown Source)
at net.minecraft.class_2378.method_10238(class_2378.java:117)
at net.minecraft.class_2378$$Lambda$122/1996556848.accept(Unknown Source)
at java.util.LinkedHashMap$LinkedEntrySet.forEach(LinkedHashMap.java:663)
at net.minecraft.class_2378.(class_2378.java:116)
at net.minecraft.class_2966.method_12851(class_2966.java:38)
at net.minecraft.class_310.(class_310.java:384)
at net.minecraft.client.main.Main.main(Main.java:154)
... 7 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.item.ItemStack
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at net.fabricmc.loader.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:160)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 24 more

log:
latest.log

Oh, boy. Looks like a messed up build. See if this works.

yes that build works now a another mod is crashing xD
you might wanan push that one to curseforge for others :)

quick question will it be possible to run 1.14 and 1.14.1 mods along side each other no matter loader versions

It depends. The main worry is if mods nest both Fabric API 0.2.7 and Fabric API 0.3.0. 0.3.0 is the new version for 1.14.1+, and will crash if it comes into contact with 0.2.7. The files in each version are effectively the same, though, so if you only have one version in your pack, you'll be fine.

thats becoming a problem quick because some devs are using 0.2.7 and some are using 0.3.0

Yeah, there's basically a hard line between the two versions. Luckily, it's a line that's only one line of code away from being fixed for 99% of mods, so mods will be coming to 1.14.1 quickly.