Pure bit not set ????

[scannercf]

I have formatted the Supradisk of my A500, and now when I boot (after re-install the WB1.3) the OS displays "Pure bit not set" when the startup-sequence tries to execute a "resident" command

What is this and how to fix it ?

Thanks a lot !!!!

[scannercf]

I FOUND HOW TO FIX THE PROBLEM
But I don´t know what´s the problem !!!  :-?

The problem is originated when I transfer files between my PC and the Amiga using Aexplorer.

After re-formatting the disk, I restored all the original disk files from a backed-up version stored in my PC hard disk, I don´t know what´s the problem but it looks like the Aexplorer changes something in the file when translates the files from the Amiga to the PC when I backed up in the first time.
Also UAE gives me these error messages when I tried to "boot" from these files.

I fixed up copying a  WB13.ADF directly to DF0: and then I copied the system files from the diskette to hard disk.

STRANGE, UH??

Thank you everybody who tried to help !!!