Details

This message is generated when the given boundary conditions cannot be used to fix the value of the arbitrary constants in the general solution.
Typically, this indicates that the boundary value problem is not well-posed, that is, the solution is not unique.
Off[message] switches off the message; On[message] switches it on. For example: Off[DSolve::bvnr].

Examples

The general solution satisfies the condition y[0]== y'[0] for every value of the constant C[1]:

Wolfram Language code: DSolve[y'[x] == y[x], y, x]

Wolfram Language code: y[0] == y'[0] /. %[[1]]

An error occurs in the following boundary value problem:

Wolfram Language code: DSolve[y'[x] == y[x] && y[0] == y'[0], y, x]

The example works fine using a boundary condition such as y[0]==1:

Wolfram Language code: DSolve[y'[x] == y[x] && y[0] == 1, y, x]

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