conflicting types for error for a function

Question

In the project that I'm working on, there's some weird error regarding pointers. I am not really sure what the problem is here.

The error says:

conflicting types for 'undo_list'

Sudoku_Board* undo_list(Linked_List* list) {
    Sudoku_Board* sboard;

    if(list->current->prev == NULL) {
        return NULL;
    }

    sboard = list->current->prev->sboard;
    list->current = list->current->prev;

    return sboard;
}

And in the header file I have the following:

typedef struct sudo_board {
    int block_row;
    int block_col;
    int** board;
    int fixed_num;
    int** fixed;
    int** current_solution;
    int mark_errors_flag;
    int** errors;
} Sudoku_Board;


typedef struct node {
    struct sudo_board* sboard;
    struct node* next;
    struct node* prev;
} Element;


typedef struct {
    Element* current;
    Element* tail;
} Linked_List;

I am using MinGW compiler

Answer 1

问题很可能是您在其他地方声明了函数，其签名与此处列出的签名不匹配。