Model Animation Wizard

Not sure where I am messingup but can not get custom Mobs to animate. MC 1.7.5 or 1.7.2

Steps I use.
1. Create a basic bipen in Techne with no changes.
•Export both Java and Texture

2. Modify texture in MCSkin3d

3 Start MCreator and add new element (Mob)
•Name mob
•Import Texture file
•Import Java file
•assign animation parts (all basic biped parts)
•assign egg colors
•Next
•assign Mob Name
•Next
•Next
•Next
•add AI Wander
•Next
•Next (Compiles fine)

4. Run in client test enviroment (No animations. mob is there and works other that animations.)
Looking at code it does not contain any commands for rotation other than setting variable

•public void setRotationAngles(float f, float f1, float f2, float f3, float f4, float f5, Entity entity) {
   super.setRotationAngles(f, f1, f2, f3, f4, f5, entity);

Does not contain any rotation angles. Have tried to add from videos what i think it should be

•this.head.rotateAngleY = f3 / (180F / (float)Math.PI);
•this.head.rotateAngleX = f4 / (180F / (float)Math.PI);
•this.leftleg.rotateAngleX = MathHelper.cos(f * 1.0F) * -1.0F *f1;
•this.rightleg.rotateAngleX = MathHelper.cos(f * 1.0F) * -1.0F *f1;
•this.rightarm.rotateAngleX = MathHelper.cos(f * 0.6662F + (float)Math.PI) * 2.0F * f1 * 0.5F;
•this.leftarm.rotateAngleX = MathHelper.cos(f * 0.6662F) * 2.0F * f1 * 0.5F;

but get an error on Symbol: variable MathHelper

If I do the same thing but pick Biped from MCreator and do not add my own Jave file it works and the Biped has full animation.