Incompatible ModLoader Mod - NullPointerException

I finally got to the server but when i got loaded in the game crashed https://pastebin.com/ADqmtkfR

Hi! I'm following Kaupenjoe's guide and making an entity, and I get a problem where two animations mix into one when my entity walks - idle  anim plays together with walking. As I'm pretty new into coding and modding, I don't know everything about what I do following his guide and I'd like to set up animations in specific way: 1. When entity is doing nothing, idle animation plays; 2. When entity is walking, only walk animation is playing Here's the code for this entity's animations, it only has 2 at the moment. What should I fix here to get the result I need? public final AnimationState idleAnimationState = new AnimationState(); private int idleAnimationTimeout = 0; @Override public void tick() { super.tick(); if(this.level().isClientSide()){ setupAnimationStates(); } } private void setupAnimationStates() { if(this.idleAnimationTimeout <= 0) { this.idleAnimationTimeout = this.random.nextInt(40) + 80; this.idleAnimationState.start(this.tickCount); } else { --this.idleAnimationTimeout; } } @Override protected void updateWalkAnimation(float pPartialTick) { float f; if(this.getPose() == Pose.STANDING) { f = Math.min(pPartialTick * 6F, 1f); } else { f = 0f; } this.walkAnimation.update(f, 0.2f); } Hopefully I got into right forum topic, I'm not very used to forum posting xDD  

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All good now?

Add crash-reports with sites like https://paste.ee/ and paste the link to it here   Delete the session.lock from the worldsave and test it again