Question: Unknown errors

Hi everybody, As a part of some general problem, I need to solve a system of non-linear ordinary differential equations.I try to get a numerical solution, so I use the "dsolve numeric" command. In same cases, the Maple print out two errors that I didn't find in his help instruction. The first one is: error, (in dsolve/numeric/bvp) cannot determine if this expression is true or false: 20*nerr
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