Distance node causes errors when plugging in inputs with different component counts

Admin edit: Changed the name of the topic
Original title: Shader program had errors - unable to find compatible overloaded function
Original post below:

Hello, I've been playing with the Shader Forge and I'm really happy with it, but I managed to create node configuration that gets compiled by Shader Forge, but the resulting shader won't get compiled by Unity. I'm not sure if this is a bug or if I did something wrong. Here are some of the errors for quick overview:

Shader error in 'Shader Forge/Test': Program 'frag', unable to find compatible overloaded function "distance(float2, error)" at line 66
Shader error in 'Shader Forge/Test': Program 'frag', unable to find compatible overloaded function "sin(error)" at line 66
Shader error in 'Shader Forge/Test': Program 'frag', unable to find compatible overloaded function "tex2D(sampler2D, error)" at line 66
Shader error in 'Shader Forge/Test': Program 'frag', undefined variable "TRANSFORM_TEX" at line 66
...

Here's the shader code itself so you can try it:
http://pastebin.com/nnpnhy8g