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The Mathematica Book

Mathematica Reference Guide

Listing of C Functions in the MathLink Library

MLClearError()

int MLClearError(MLINK link) if possible clears any error on link and reactivates the link.

MLClearError() returns 0 if it was unable to clear the error. This can happen if the error was for example the result of a link no longer being open.

See The Mathematica Book: Section 2.12.13.