ignoring an error message

hi,
I am trying to use the load of files in a certain category in order
to use them as constraints for my current category optimization .
however, sometimes no previous files in the previous category exist.
for example:

??? Error using ==> load
Unable to read file LynchAAA31-Dec-1998: No such file or directory.

Error in ==> LynchNSAA at 43
load (new_filename2,'shxCont','NSXbR')

where 'shxCont','NSXbR' were intended to be the constrainst. is there
a way to ignore the error when the files don't exist.i.e is there a
way to tell matlab if there is this error message ignore it and
switch to another optimization without the constraint? (i will
develop codes for the optimization without the constraint)
UI hope my question is clear
JF
.

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