Im on SpongeForge 1065
Forge Version: 11.15.0.1707

[14:34:28] [Server thread/ERROR] [Sponge/sponge]: Could not pass FMLPreInitializationEvent to Plugin{id=PermissionsEx, name=PermissionsEx, version=2.0-SNAPSHOT}
java.lang.RuntimeException: Error occurred while enabling PermissionsEx
at ninja.leaping.permissionsex.sponge.PermissionsExPlugin.onPreInit(PermissionsExPlugin.java:136) ~[PermissionsExPlugin.class:?]
at org.spongepowered.common.event.listener.GamePreInitializationEventListener_PermissionsExPlugin_onPreInit4.handle(Unknown Source) ~[?:?]
at org.spongepowered.common.event.RegisteredListener.handle(RegisteredListener.java:86) ~[RegisteredListener.class:1.8.9-1694-3.1.0-BETA-1065]
at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:233) [SpongeModEventManager.class:1.8.9-1694-3.1.0-BETA-1065]
at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:277) [SpongeModEventManager.class:1.8.9-1694-3.1.0-BETA-1065]
at org.spongepowered.mod.SpongeMod.onStateEvent(SpongeMod.java:184) [SpongeMod.class:1.8.9-1694-3.1.0-BETA-1065]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_45]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_45]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_45]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_45]
at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74) [minecraft_server.1.8.9.jar:?]
at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47) [minecraft_server.1.8.9.jar:?]
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322) [minecraft_server.1.8.9.jar:?]
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304) [minecraft_server.1.8.9.jar:?]
at com.google.common.eventbus.EventBus.post(EventBus.java:275) [minecraft_server.1.8.9.jar:?]
at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:211) [LoadController.class:?]
at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:189) [LoadController.class:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_45]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_45]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_45]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_45]
at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74) [minecraft_server.1.8.9.jar:?]
at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47) [minecraft_server.1.8.9.jar:?]
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322) [minecraft_server.1.8.9.jar:?]
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304) [minecraft_server.1.8.9.jar:?]
at com.google.common.eventbus.EventBus.post(EventBus.java:275) [minecraft_server.1.8.9.jar:?]
at net.minecraftforge.fml.common.LoadController.onPost(LoadController.java:53) [LoadController.class:?]
at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:118) [LoadController.class:?]
at net.minecraftforge.fml.common.Loader.preinitializeMods(Loader.java:556) [Loader.class:?]
at net.minecraftforge.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:88) [FMLServerHandler.class:?]
at net.minecraftforge.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:319) [FMLCommonHandler.class:?]
at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:112) [ko.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:441) [MinecraftServer.class:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_45]
Caused by: java.io.IOException: configurate.typesafe.config.ConfigException$Parse: Reader: 23: Expecting end of input or a comma, got ':' (if you intended ':' to be part of a key or string value, try enclosing the key or value in double quotes)
at ninja.leaping.configurate.loader.AbstractConfigurationLoader.load(AbstractConfigurationLoader.java:157) ~[spongeforge-1.8.9-1694-3.1.0-BETA-1065.jar:1.8.9-1694-3.1.0-BETA-1065]
at ninja.leaping.configurate.loader.ConfigurationLoader.load(ConfigurationLoader.java:42) ~[spongeforge-1.8.9-1694-3.1.0-BETA-1065.jar:1.8.9-1694-3.1.0-BETA-1065]
at ninja.leaping.permissionsex.config.FilePermissionsExConfiguration.fromLoader(FilePermissionsExConfiguration.java:63) ~[FilePermissionsExConfiguration.class:?]
at ninja.leaping.permissionsex.sponge.PermissionsExPlugin.onPreInit(PermissionsExPlugin.java:134) ~[PermissionsExPlugin.class:?]
... 33 more
Caused by: configurate.typesafe.config.ConfigException$Parse: Reader: 23: Expecting end of input or a comma, got ':' (if you intended ':' to be part of a key or string value, try enclosing the key or value in double quotes)
at configurate.typesafe.config.impl.ConfigDocumentParser$ParseContext.parseError(ConfigDocumentParser.java:201) ~[ConfigDocumentParser$ParseContext.class:1.8.9-1694-3.1.0-BETA-1065]
at configurate.typesafe.config.impl.ConfigDocumentParser$ParseContext.parseError(ConfigDocumentParser.java:197) ~[ConfigDocumentParser$ParseContext.class:1.8.9-1694-3.1.0-BETA-1065]
at configurate.typesafe.config.impl.ConfigDocumentParser$ParseContext.parseObject(ConfigDocumentParser.java:482) ~[ConfigDocumentParser$ParseContext.class:1.8.9-1694-3.1.0-BETA-1065]
at configurate.typesafe.config.impl.ConfigDocumentParser$ParseContext.parse(ConfigDocumentParser.java:595) ~[ConfigDocumentParser$ParseContext.class:1.8.9-1694-3.1.0-BETA-1065]
at configurate.typesafe.config.impl.ConfigDocumentParser.parse(ConfigDocumentParser.java:14) ~[ConfigDocumentParser.class:1.8.9-1694-3.1.0-BETA-1065]
at configurate.typesafe.config.impl.Parseable.rawParseValue(Parseable.java:260) ~[Parseable.class:1.8.9-1694-3.1.0-BETA-1065]
at configurate.typesafe.config.impl.Parseable.rawParseValue(Parseable.java:248) ~[Parseable.class:1.8.9-1694-3.1.0-BETA-1065]
at configurate.typesafe.config.impl.Parseable.parseValue(Parseable.java:180) ~[Parseable.class:1.8.9-1694-3.1.0-BETA-1065]
at configurate.typesafe.config.impl.Parseable.parseValue(Parseable.java:174) ~[Parseable.class:1.8.9-1694-3.1.0-BETA-1065]
at configurate.typesafe.config.impl.Parseable.parse(Parseable.java:299) ~[Parseable.class:1.8.9-1694-3.1.0-BETA-1065]
at configurate.typesafe.config.ConfigFactory.parseReader(ConfigFactory.java:668) ~[ConfigFactory.class:1.8.9-1694-3.1.0-BETA-1065]
at ninja.leaping.configurate.hocon.HoconConfigurationLoader.loadInternal(HoconConfigurationLoader.java:104) ~[spongeforge-1.8.9-1694-3.1.0-BETA-1065.jar:1.8.9-1694-3.1.0-BETA-1065]
at ninja.leaping.configurate.hocon.HoconConfigurationLoader.loadInternal(HoconConfigurationLoader.java:54) ~[spongeforge-1.8.9-1694-3.1.0-BETA-1065.jar:1.8.9-1694-3.1.0-BETA-1065]
at ninja.leaping.configurate.loader.AbstractConfigurationLoader.load(AbstractConfigurationLoader.java:149) ~[spongeforge-1.8.9-1694-3.1.0-BETA-1065.jar:1.8.9-1694-3.1.0-BETA-1065]
at ninja.leaping.configurate.loader.ConfigurationLoader.load(ConfigurationLoader.java:42) ~[spongeforge-1.8.9-1694-3.1.0-BETA-1065.jar:1.8.9-1694-3.1.0-BETA-1065]
at ninja.leaping.permissionsex.config.FilePermissionsExConfiguration.fromLoader(FilePermissionsExConfiguration.java:63) ~[FilePermissionsExConfiguration.class:?]
at ninja.leaping.permissionsex.sponge.PermissionsExPlugin.onPreInit(PermissionsExPlugin.java:134) ~[PermissionsExPlugin.class:?]
... 33 more
[14:34:28] [Server thread/TRACE] [sponge/sponge]: Sent event FMLPreInitializationEvent to mod sponge

You have a syntax error in your permissionsex.conf file -- pastebin it if you want some help.

Unfortunately PermissionsEx is currently unmaintained and no further updates are planned. Because of this, all pull requests are being closed. If you are looking for an actively maintained permissions plugin, take a look at LuckPerms. It is compatible with major server platforms and can import data from PEX.