I've been getting this error too on my clip+. I was using the revision 27902,
and about 10 seconds after I turn it on, I get this message error: "*PANIC* transfer error : -19".
I try to update to the lastest revision with the rockbox utility (r27907 at the time)
and still get the same error. I try then to manually install rockbox and that din't work neither.
At last, I unnistall rockbox, then I install the original firmare (v01.02.15) and then
install rockbox with the rockbox utility and nothing work.
Can someone tell me please how can I fix this???