[12:28:43] [main/FATAL] [minecraft/Minecraft]: Unreported exception thrown!
java.lang.NoSuchMethodError: sereneseasons.api.season.SeasonHelper.canSnowAtTempInSeason(Lsereneseasons/api/season/Season;F)Z
at org.blockartistry.DynSurround.registry.season.SeasonInfoSereneSeasons.showFrostBreath(SeasonInfoSereneSeasons.java:107) ~[SeasonInfoSereneSeasons.class:?]
at org.blockartistry.DynSurround.registry.SeasonRegistry.showFrostBreath(SeasonRegistry.java:135) ~[SeasonRegistry.class:?]
at org.blockartistry.DynSurround.client.handlers.effects.FrostBreathEffect.isPossibleToShow(FrostBreathEffect.java:83) ~[FrostBreathEffect.class:?]
at org.blockartistry.DynSurround.client.handlers.effects.FrostBreathEffect.update(FrostBreathEffect.java:72) ~[FrostBreathEffect.class:?]
at org.blockartistry.DynSurround.client.effects.EntityEffectHandler.update(EntityEffectHandler.java:108) ~[EntityEffectHandler.class:?]
at org.blockartistry.DynSurround.client.handlers.FxHandler.lambda$static$1(FxHandler.java:94) ~[FxHandler.class:?]
at org.blockartistry.lib.collections.CollectionUtils.removeIf(CollectionUtils.java:42) ~[CollectionUtils.class:?]
at org.blockartistry.DynSurround.client.handlers.FxHandler.process(FxHandler.java:127) ~[FxHandler.class:?]
at org.blockartistry.DynSurround.client.handlers.EffectManager.onTick(EffectManager.java:173) ~[EffectManager.class:?]
at org.blockartistry.DynSurround.client.handlers.EffectManager.clientTick(EffectManager.java:183) ~[EffectManager.class:?]
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_635_EffectManager_clientTick_ClientTickEvent.invoke(.dynamic) ~[?:?]
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90) ~[ASMEventHandler.class:?]
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:182) ~[EventBus.class:?]
at net.minecraftforge.fml.common.FMLCommonHandler.onPreClientTick(FMLCommonHandler.java:344) ~[FMLCommonHandler.class:?]
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1707) ~[bib.class:?]
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1097) ~[bib.class:?]
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:397) [bib.class:?]
at net.minecraft.client.main.Main.main(SourceFile:123) [Main.class:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_191]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_191]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_191]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_191]
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.12.jar:?]
at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_191]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_191]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_191]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_191]
at org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:196) [NewLaunch.jar:?]
at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:231) [NewLaunch.jar:?]
at org.multimc.EntryPoint.listen(EntryPoint.java:143) [NewLaunch.jar:?]
at org.multimc.EntryPoint.main(EntryPoint.java:34) [NewLaunch.jar:?]

I too am having a crash. My save game is crashing with versions 1.28 and 1.29 but can play with version 1.26 without a problem. Adding to this thread because mine involves 'Dynamic Surroundings' as well.

Minecraft.txt

We've updated our API to allow them to fix the issue on their end, so you'll just have to wait until they do so.