error: expected expression before ‘char’

Excuse me , I have a problem when I compile my code, and i don't don't how to solve it because I don't know what it ask for.

This appears me in the terminal:

" usr/lib/gcc/x86_64-linux-gnu/4.9/../../../x86_64-linux-gnu/crt1.o: In the functión _start': /build/buildd/glibc-2.21/csu/../sysdeps/x86_64/start.S:114: reference tomain' without define collect2: error: ld returned 1 exit status "

I leave my code:

#include<stdio.h>
#include<string.h>
void calcular_vocal(char cadena[]){
   int l;
   char vocales[5]="a,e,i,o,u";
   int i, vector contadores[5];
   l=strlen(cadena);
   for(i=0;i<l;i++){
     if(cadena[i] =='a')
        cadena a++;
        vector contadores[0]++;
     if(cadena[i] =='e')
        cadena e++;
        vector contadores[1]++;;
     if(cadena[i] == 'i')
        cadena i++;
        vector contadores[2]++;
     if(cadena[i] =='o')
        cadena o++;
        vector contadores[3]++;
     if(cadena[i] =='u')
        cadena u++;
        vector contadores[4]++;
    for(i=0;i<5;i++){
      int max,pos;
      if(vector contadores[i]>max){
         max = vector contadores [i];
         pos = i;
      }
    }
     printf("The most repeated vocal is %c %d",vocales[pos],max);
   }
}
int main (void){
   char calcular_vocal(char[]);
}