As you load character animation using the 
> File > Load Character Animation option in the Character Controls, a dialog box may appear to warn you that the operation was not completed successfully.
Depending on the options you selected in the Load Character Animation Options dialog box and the contents of the source file you selected, you may encounter one or more of the following messages in the Error Loading File(s) dialog box.
No Control rig in the source file
To correct this problem, disable the Replace Control Rig option, or make sure there is a Control rig in the source file you select, then try again.
No character in the source file
This message appears if there is no character in the source file you have selected.
To correct this problem, make sure there is a character in the source file you select, then try again.
Animation was not transferred
This message can appear for one or more of the following reasons:
- The plot operation failed, because there is no character in the source file.
- There was no character in the source file.
- There was no Control rig in the source file.
- There was no character in the current scene.
- There was no Control rig in the current scene.
- The Control rig in the source file was not connected to the Control rig in the current scene. Either there is no character in the source file, or there is another problem.
Error Loading Files dialog box: Animation was not transferred