This message is generated when the Integrate function is unable to determine whether or not there are any singularities in the range of integration that may affect the result, or is unable to analyze the effect of the singularities that are found.
This message does not necessarily indicate that the result is incorrect, but results that are accompanied by this message should be checked.
This message normally indicates that a definite integral was computed by taking limits of the corresponding indefinite integral (antiderivative), and that Integrate was unable to verify continuity of the indefinite integral.
Off[message] switches off the message; On[message] switches it on. For example: Off[Integrate::gener].