a.h

typedef struct
{
    int a;
} ctx_t;

.....
-----------------------------

b.h

typedef struct
{
    int b;
} ctx_t;

....
-----------------------------
a.c

#include "a.h"

void func()
{
    ctx_t *ctx = calloc(1, sizeof(ctx_t));
    ctx->a = 9; //[u][b]here I got the error: Field 'a' could not be resolved[/b][/u]
}
...