there is a _CrtDbgReport Error when changing the Character Set

[EDN Admin]

i get a new application without using  Unicode Character Set, and later, i chang the Character Set  from Use Multi-Byte Character Set to Use Unicode Character Set. build is ok, but when i debug the application, TRACE dont work, and a error arise:
_CrtDbgReport: String too long or IO Error.
 
my TRACE is :TRACE(_T("fdsafdsafdsa%sn"),"ly");
but the string isnt too long . How can I make TRACE work?

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