Question: How do I solve this problem?

Hi, I am trying to solve a time dependent partial differential equation using pdsolve in maple 11, but when I try to plot the solution I get the following error message: Error, (in pdsolve/numeric/plot) unable to compute solution for t>.200000000000000011: unable to store Float(undefined)+Float(undefined)*I when datatype=float[8] I am new to Maple and I don't know what that error message really means. Can someone please help me? Thanks
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