无效的初始化程序-结构数组

我在给赋值时遇到问题cv。根据下面的代码，我明白error: invalid initializer了：

ChVec cv = r->cv;

有人知道这个问题可能是什么吗？

谢谢你的帮助。

元组

#include "defs.h"
#include "tuple.h"
#include "reln.h"
#include "hash.h"
#include "chvec.h"
#include "bits.h"

Bits tupleHash(Reln r, Tuple t)
{
    ChVec cv = r->cv;
    ...
    ...
}

chvec.h

#include "defs.h"
#include "reln.h"

#define MAXCHVEC 32

typedef struct {
    Byte att;
    Byte bit;
} ChVecItem;

typedef ChVecItem ChVec[MAXCHVEC];

ln

#ifndef RELN_H
#define RELN_H 1

typedef struct RelnRep *Reln;

#include "defs.h"
#include "tuple.h"
#include "chvec.h"
#include "page.h"


struct RelnRep {
    Count  nattrs; // number of attributes
    Count  depth;  // depth of main data file
    Offset sp;     // split pointer
    Count  npages; // number of main data pages
    Count  ntups;  // total number of tuples
    ChVec  cv;     // choice vector
    char   mode;   // open for read/write
    FILE  *info;   // handle on info file
    FILE  *data;   // handle on data file
    FILE  *ovflow; // handle on ovflow file
};