Parent rig with automatic weights?

[Karmaterrorᵁᴷ]

Following along with a guide and when i try to parent them it says "failed to find a solution for one or more bones"

I noticed a comment that said to use Ctrl+A and apply locRotSca so i did that for the mesh and the rig, but still same error :(

Any ideas?

[Pte Jack]

What this means is more or less is

that the mesh is either too far from the bones for auto weights to determine what bone to apply to it,

you have mesh on top of mesh (like legs under pants or arms under sleeves) and the auto weight function can't determine what bone to apply to what vertex,

the actual size of your mesh and armature are too small for the calculations to take place or,

as you pointed out the transforms between the mesh and the armature aren't set the same or

you have disconnected bones with too much distance between the heads and tails.

There's quite a list that could cause this.

[Karmaterrorᵁᴷ]

Thinking maybe there isnt enough topology in the middle for the spine bones?

I did just read that things not connected to the main mesh can cause it, the whiskers are little meshes made with particle system then converted and joined to the body...

EDIT Got it sorted, at some point i must have duplicated my entire mesh on top of itself... merged all by distance and it cleaned up hundreds of verts.... then auto weights worked :)