I'm using MultiMC Version 0.6.16--3430 on lin64

using instance of minecraft of 1.19.1 with LWJGL 3.31, Forge 42.0.9, Intermediary Mappings 1.19.1, Fabric loader 0.14.10, and Quilt loader 0.17.4.

My Operating system is Pop!_OS with the KDE desktop environment

The mod I am using came from the source code and compiling it

log:
[13:43:48] [main/INFO]: Loading Minecraft 1.19.1 with Quilt Loader 0.17.4
[13:43:48] [ForkJoinPool-1-worker-2/WARN]: Warnings for mod "bedrockify"'s mod json:

• Version ${version} does not respect SemVer -- comparison support is limited. "version" at at line 4 column 26 path $.version
  [13:43:48] [main/ERROR]: Incompatible mod set!
  org.quiltmc.loader.impl.FormattedException: org.quiltmc.loader.impl.discovery.ModResolutionException: Mod resolution failed!
  at org.quiltmc.loader.impl.QuiltLoaderImpl.load(QuiltLoaderImpl.java:214) ~[quilt-loader-0.17.4.jar:?]
  at org.quiltmc.loader.impl.launch.knot.Knot.init(Knot.java:141) ~[quilt-loader-0.17.4.jar:?]
  at org.quiltmc.loader.impl.launch.knot.Knot.launch(Knot.java:70) [quilt-loader-0.17.4.jar:?]
  at org.quiltmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:24) [quilt-loader-0.17.4.jar:?]
  at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
  at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[?:?]
  at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
  at java.lang.reflect.Method.invoke(Method.java:568) ~[?:?]
  at org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:210) [NewLaunch.jar:?]
  at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:245) [NewLaunch.jar:?]
  at org.multimc.EntryPoint.listen(EntryPoint.java:143) [NewLaunch.jar:?]
  at org.multimc.EntryPoint.main(EntryPoint.java:34) [NewLaunch.jar:?]
  Caused by: org.quiltmc.loader.impl.discovery.ModResolutionException: Mod resolution failed!
  at org.quiltmc.loader.impl.discovery.ModResolver.resolve(ModResolver.java:427) ~[quilt-loader-0.17.4.jar:?]
  at org.quiltmc.loader.impl.QuiltLoaderImpl.setup(QuiltLoaderImpl.java:223) ~[quilt-loader-0.17.4.jar:?]
  at org.quiltmc.loader.impl.QuiltLoaderImpl.load(QuiltLoaderImpl.java:212) ~[quilt-loader-0.17.4.jar:?]
  ... 11 more
  Caused by: java.lang.RuntimeException: java.lang.RuntimeException: Mod at "/home/ethanboi/.local/share/multimc/instances/1.19.1/.minecraft/mods/bedrockify-1.5.1+mc1.19.1-sources.jar" has an invalid fabric.mod.json file!
  at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:?]
  at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77) ~[?:?]
  at jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:?]
  at java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499) ~[?:?]
  at java.lang.reflect.Constructor.newInstance(Constructor.java:480) ~[?:?]
  at java.util.concurrent.ForkJoinTask.getThrowableException(ForkJoinTask.java:562) ~[?:?]
  at java.util.concurrent.ForkJoinTask.getException(ForkJoinTask.java:580) ~[?:?]
  at java.util.concurrent.ForkJoinTask.getException(ForkJoinTask.java:909) ~[?:?]
  at org.quiltmc.loader.impl.discovery.ModResolver.resolve(ModResolver.java:410) ~[quilt-loader-0.17.4.jar:?]
  at org.quiltmc.loader.impl.QuiltLoaderImpl.setup(QuiltLoaderImpl.java:223) ~[quilt-loader-0.17.4.jar:?]
  at org.quiltmc.loader.impl.QuiltLoaderImpl.load(QuiltLoaderImpl.java:212) ~[quilt-loader-0.17.4.jar:?]
  ... 11 more
  Caused by: java.lang.RuntimeException: Mod at "/home/ethanboi/.local/share/multimc/instances/1.19.1/.minecraft/mods/bedrockify-1.5.1+mc1.19.1-sources.jar" has an invalid fabric.mod.json file!
  at org.quiltmc.loader.impl.discovery.ModResolver$ProcessAction.compute(ModResolver.java:222) ~[quilt-loader-0.17.4.jar:?]
  at java.util.concurrent.RecursiveAction.exec(RecursiveAction.java:194) ~[?:?]
  at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373) ~[?:?]
  at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182) ~[?:?]
  at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655) ~[?:?]
  at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622) ~[?:?]
  at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165) ~[?:?]
  Caused by: org.quiltmc.loader.impl.metadata.ParseMetadataException: Error reading fabric.mod.json file for mod at unknown location: java.lang.NullPointerException: Cannot invoke "net.fabricmc.loader.impl.launch.FabricLauncher.isDevelopment()" because the return value of "net.fabricmc.loader.impl.launch.FabricLauncherBase.getLauncher()" is null
  at org.quiltmc.loader.impl.metadata.FabricModMetadataReader.parseMetadata(FabricModMetadataReader.java:85) ~[quilt-loader-0.17.4.jar:?]
  at org.quiltmc.loader.impl.metadata.FabricModMetadataReader.parseMetadata(FabricModMetadataReader.java:56) ~[quilt-loader-0.17.4.jar:?]
  at org.quiltmc.loader.impl.discovery.ModResolver$ProcessAction.compute(ModResolver.java:218) ~[quilt-loader-0.17.4.jar:?]
  at java.util.concurrent.RecursiveAction.exec(RecursiveAction.java:194) ~[?:?]
  at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373) ~[?:?]
  at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182) ~[?:?]
  at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655) ~[?:?]
  at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622) ~[?:?]
  at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165) ~[?:?]
  Caused by: java.lang.NullPointerException: Cannot invoke "net.fabricmc.loader.impl.launch.FabricLauncher.isDevelopment()" because the return value of "net.fabricmc.loader.impl.launch.FabricLauncherBase.getLauncher()" is null
  at net.fabricmc.loader.impl.FabricLoaderImpl.isDevelopmentEnvironment(FabricLoaderImpl.java:376) ~[fabric-loader-0.14.10.jar:?]
  at org.quiltmc.loader.impl.metadata.FabricModMetadataReader.parseMetadata(FabricModMetadataReader.java:72) ~[quilt-loader-0.17.4.jar:?]
  at org.quiltmc.loader.impl.metadata.FabricModMetadataReader.parseMetadata(FabricModMetadataReader.java:56) ~[quilt-loader-0.17.4.jar:?]
  at org.quiltmc.loader.impl.discovery.ModResolver$ProcessAction.compute(ModResolver.java:218) ~[quilt-loader-0.17.4.jar:?]
  at java.util.concurrent.RecursiveAction.exec(RecursiveAction.java:194) ~[?:?]
  at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373) ~[?:?]
  at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182) ~[?:?]
  at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655) ~[?:?]
  at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622) ~[?:?]
  at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165) ~[?:?]

Seems that you have downloaded the wrong bedrockIfy version. if you see in the mod file name, it ends in ...sources.jar. This file is only used for development. Please try this file