invert() no inverse exists

The error message "invert() no inverse exists" indicates that the matrix you are trying to invert is not invertible. In linear algebra, a matrix is invertible if and only if its determinant is non-zero. If the determinant is zero, the matrix is singular and has no inverse.

There could be several reasons why a matrix is not invertible. For example, if a matrix has dependent rows or columns, or if it contains redundant information, it may not be invertible.

To avoid this error, you can check the determinant of the matrix before attempting to invert it. If the determinant is zero, you can either try to remove redundant information from the matrix or use a different method to solve the problem.