lyx hangs when clicked on view pdf/ dvi

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lyx hangs when clicked on view pdf/ dvi

kvramya
Hi,

lyx version 1.5.3
ubuntu 7.10

when ever i try to view the .lyx file i wrote for a c program, lyx stops
responding and i have to forcibly quit it.

format used: C
added by : format:c GUIname:C shortcut:c extension:c and with document format, viewer and editor:emacs
converter: noweb-->C (using notangle $$i>$$o)

Menu warning: menu entries "Custom...|C" and "C|C" share the same shortcut.
PreferencesPolicy: No transition for input SMI_RESTORE from state INITIAL
Menu warning: menu entries "C|C" and "Close All Insets|C" share the same shortcut.
newfile1.nw:23: unescaped << in documentation chunk
newfile1.nw:30: unescaped << in documentation chunk
Error: Cannot convert file
------------------------------
----------
An error occurred whilst running notangle 'newfile1.nw' > 'newfile1.c'
Menu warning: menu entries "C|C" and "Close All Insets|C" share the same shortcut.
newfile1.nw:23: unescaped << in documentation chunk
newfile1.nw:30: unescaped << in documentation chunk
Error: Cannot convert file
----------------------------------------
An error occurred whilst running notangle 'newfile1.nw' > 'newfile1.c'
Menu warning: menu entries "C|C" and "Close All Insets|C" share the same shortcut.
newfile1.nw:23: unescaped << in documentation chunk
newfile1.nw:30: unescaped << in documentation chunk
Error: Cannot view file

Does anybody know what these errors mean and how can i go about fixing it?

Regards,