c - vector allocation error subscript to pointer to incomplete type -

i have product

typedef struct proditem *proditem; 

and have symbol table of products

typedef struct tabp *tabp; struct tabp {     proditem vettp;     int np; }; 

i need allocate in memory, :

tab->np = max; // quantity of products tab->vettp = malloc(max * sizeof(*proditem)); 

but if try use vector tab->vettp have error:

tab->vettp[i] <<-- subscript pointer incomplete type

can me?

i solved myself, missing pointer *

typedef struct tabp *tabp; struct tabp {     proditem *vettp;     int np; }; 

product item.h:

#ifndef proditem_h #define proditem_h  #include <stdio.h> #include <stdlib.h>  typedef struct proditem *proditem; typedef char* prodkey ;  proditem proditemscan(file*); void proditemshow(file*, proditem); int proditemcheckvoid(proditem); void proditemfree(proditem); int proditemgreater(proditem,proditem);  prodkey prodkeyget(proditem); int prodkeycomp(prodkey, prodkey); #endif /* proditem_h */ 

symbol table.h

#ifndef tabp_h #define tabp_h  #include <stdio.h> #include "proditem.h"  typedef struct tabp *tabp;  tabp tabpscan(file*); void tabpshow(file*,tabp);  void tabpfree(tabp); int tabpcount(tabp); int tabpsearch(tabp, prodkey);  #endif /* tabp_h */ 

symbol table.c

#include "tabp.h"  struct tabp {     proditem *vettp;     int np; };  tabp tabpscan(file *f) {     int max;     fscanf(f,"%d", &max);     tabp tab = malloc((sizeof(*tab)));     tab->np = max;     tab->vettp = malloc(max * sizeof(proditem));      for(int i=0; i<max; i++) {         tab->vettp[i] = proditemscan(f);      }      return tab; }  void tabpshow(file *f, tabp tab){     for(int i=0; i<tab->np; i++) {         proditemshow(f, tab->vettp[i]);     } }  int tabpcount(tabp tab) {     return tab->np; }  int tabpsearch(tabp tab, prodkey key) {     (int i=0; i<tab->np; i++) {         if (prodkeycomp( prodkeyget(tab->vettp[i]), key)==1){             return i;         }     }     return -1; }