Issue with Cisco 3548XL Switch

Hi all,
Trying out the xmodem process for uploading an IOS. When I try to send the file, it keeps on telling me permission denied.
Here's the output

switch: copy xmodem:flash c3500xl-c3h2s-mz.120-5.WC17.bin
Begin the Xmodem or Xmodem-1K transfer now...
CCCBB0c3500xl-c3h2s-mz.120-5.WC17.bin: permission denied

what's the issue?

Duh!!!
Was putting the wrong sequence of command parameter

Should have been the following:

copy xmodem: new_IOS.bin flash:new_IOS.bin

where new_IOS.bin is the name of the new IOS file.

*phew*. Solved one more mystery again

Ok that will take about 42 mins for the entire IOS to be uploaded. Thankfully the IOS is not that big. Lesson learnt