(1) The first warning is harmless. (The warning message is also nonsense since Spine.Animation is not a component and would never be added as a component)
(2) The second error is kinda harmless. Please double click that to open the script, then look for this part (or something similar) around lines 21-25. It could be different based on what Spine-Unity you downloaded:
#if UNITY_5_1
rb.freezeRotation = true;
#else
rb.fixedAngle = true;
#endif
And just replace that whole thing with just:
rb.fixedAngle = true;
I'm not sure why your Unity setup claimed it was Unity 5.1 but it seems to have declared it.