Many time this error/warning will come, when it is running warpage analysis.
** ERROR 201426 ** Memory allocation failure. Element/node numbering may have large gaps.
as there may be a huge gap in elemental/nodal numbering. Although the model is small, the sparse numbering of elements/nodes requires more memory than is available. solution for is Renumbeing elments /nodes.
It should be corrected default before each anysis starts.
re-numbering the elements /nodes done default before each anysis