Cant change Angular Materials paginator value after using viewChild signal

I need to change my tables paginators pageIndex and pageSize, my code works well when i use ViewChild, but i want to use signal query, when i use signal query i got this error;

Writing to signals is not allowed in a computed or an effect by default.

///@ViewChild('paginator') paginator: MatPaginator; -->this works
paginator = viewChild<MatPaginator>('paginator');

_onPaginationChange(event: PageEvent) {
const previousPageIndex = this.req.pageNumber - 1;
const previousPageSize = this.req.pageSize;

this.checkModifiedCellsAndCallback(() => {
this.req.pageNumber = event.pageIndex + 1;
this.req.pageSize = event.pageSize;
this.getTableData();
});

// Revert paginator state if the user cancels the action
if (this.modifiedCells.size > 0) {
setTimeout(() => {
paginator.pageIndex = previousPageIndex;
paginator.pageSize = previousPageSize;
});
}
}

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