When exporting a fbx file with animation from a blender for unity3D, the animation does not work and its framerate becomes 0 and an error appears in the console "Model 'Fan' contains animation clip 'BFan|Armature.001Action.002' which has length of 0 frames (start=0, end=1). It will result in empty animation. " "ImportFBX Errors:Framerate was set to 0.00, it's been reset to 1.0."enter image description here