看错在哪里，怎么改

#include<stdio.h>
#include<stdlib.h>
#include<conio.h>

typedef struct alist{
int n;
int maxsize;
int score[10];  //arry
};  
typedef struct allist *List;
 List ListInit(int size);
int ListEmpty(List L);
int ListLength(List L);
int ListRetrieve(int k ,List L);
int ListLocate(int x,List L);
void ListInsert(int k, int x, List L);
int ListDelete(int k,List L);
void PrintList(List L);


List ListInit(int size){
List L= malloc(sizeof * L);
L -> score= malloc(sizeof(int));
L -> maxsize =size;
 L -> n=0;
 return L;
} 

int ListEmpty(List L){
return L -> n == 0;
} 
int ListLength(List L){
return  L -> n;
};

int ListLocate(int x,List L){
 int i;
 for(i=0;i< L->n; i++) 
 if(L -> score[i] == x ) return ++i;
 return 0;
  
} 
int ListRetrieve(int k,List L){
if(k<1|| k> L->n) Error("out of bounds");
return L-> score[k-1];

} 
void ListInsert(int k,int x ,List L){
int i;
if(k<0 || k >L->n)Error("out of bounds");
 if(L->n== L-> maxsize)Error("out of bounds");
 for(i= L->n-1; i>=k; i--)L->score[i+1] =L->score[i];
 L->score[k]=x;
 L->n++;
} 
int ListDelete(int k,List L){
int i;int x;
 if(k<1 || k>L->n)Error("out of bounds");
   x=L ->score[k-1];
   for(i=k;i< L-> n; i++)L->score[i-1]=L->score[i];
    L->n--;
    return x;
    
} 
 
void printList(List L)
{
int i;
for(i=0;i<L->n;i++) ItemShow(L->score[i]);
}

--------------------配置: mingw5 - LIB Debug, 编译器类型: MinGW--------------------

检查文件依赖性...
正在编译 D:\C\list_arry\List_arry.c...
[Warning] D:\C\list_arry\List_arry.c:9: warning: useless keyword or type name in empty declaration
[Error] D:\C\list_arry\List_arry.c:22: error: dereferencing pointer to incomplete type
[Error] D:\C\list_arry\List_arry.c:23: error: dereferencing pointer to incomplete type
[Error] D:\C\list_arry\List_arry.c:24: error: dereferencing pointer to incomplete type
[Error] D:\C\list_arry\List_arry.c:25: error: dereferencing pointer to incomplete type
[Error] D:\C\list_arry\List_arry.c:30: error: dereferencing pointer to incomplete type
[Error] D:\C\list_arry\List_arry.c:33: error: dereferencing pointer to incomplete type
[Error] D:\C\list_arry\List_arry.c:38: error: dereferencing pointer to incomplete type
[Error] D:\C\list_arry\List_arry.c:39: error: dereferencing pointer to incomplete type

[Error] D:\C\list_arry\List_arry.c:44: error: dereferencing pointer to incomplete type
[Error] D:\C\list_arry\List_arry.c:45: error: dereferencing pointer to incomplete type
[Error] D:\C\list_arry\List_arry.c:50: error: dereferencing pointer to incomplete type
[Error] D:\C\list_arry\List_arry.c:51: error: dereferencing pointer to incomplete type
[Error] D:\C\list_arry\List_arry.c:51: error: dereferencing pointer to incomplete type
[Error] D:\C\list_arry\List_arry.c:52: error: dereferencing pointer to incomplete type
[Error] D:\C\list_arry\List_arry.c:52: error: dereferencing pointer to incomplete type
[Error] D:\C\list_arry\List_arry.c:52: error: dereferencing pointer to incomplete type
[Error] D:\C\list_arry\List_arry.c:53: error: dereferencing pointer to incomplete type
[Error] D:\C\list_arry\List_arry.c:54: error: dereferencing pointer to incomplete type
[Error] D:\C\list_arry\List_arry.c:58: error: dereferencing pointer to incomplete type
[Error] D:\C\list_arry\List_arry.c:59: error: dereferencing pointer to incomplete type
[Error] D:\C\list_arry\List_arry.c:60: error: dereferencing pointer to incomplete type
[Error] D:\C\list_arry\List_arry.c:60: error: dereferencing pointer to incomplete type
[Error] D:\C\list_arry\List_arry.c:60: error: dereferencing pointer to incomplete type
[Error] D:\C\list_arry\List_arry.c:61: error: dereferencing pointer to incomplete type
[Error] D:\C\list_arry\List_arry.c:69: error: dereferencing pointer to incomplete type
[Error] D:\C\list_arry\List_arry.c:69: error: dereferencing pointer to incomplete type
[Warning] D:\C\list_arry\List_arry.c:70:2: warning: no newline at end of file

构建中止 List_arry: 26 个错误, 2 个警告

C struct
[解决办法]

List L= malloc(sizeof * L);
//改为
List L = malloc(sizeof(alist));
//或者
List L;
L = malloc(sizeof(*L));