Details

This message is generated when the boundary conditions do not lead to equations which can be used to find the values of the arbitrary constants in the general solution.
Off[message] switches off the message; On[message] switches it on. For example: Off[DSolve::bvfail].

Examples

The values of the arbitrary constants in the general solution cannot be found:

Wolfram Language code: DSolve[y'[x] == x && f[y[1], y[1]] == 5, y, x]

Replace this boundary condition with a polynomial function of y[1]:

Wolfram Language code: sol = DSolve[y'[x] == x && y[1] + y[1] ^ 2 == 5, y, x]

Wolfram Language code: y[1] + y[1] ^ 2 /. sol//Simplify

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