C++ 错误：包含文件时类型名称未知

我正在创建一个函数，其中我需要两个不同的 struct 位于不同的文件中，所以我try 将文件包含在彼此内部，这对第一个函数有效，但其他函数给我这个错误

错误:未知的类型名称‘Actives’

"Activity"是文件中的 struct 类型

文件companies. h，其中错误是

#ifndef COMPANIES_H
#define COMPANIES_H

#ifdef __cplusplus
extern "C" {
#endif

#include "activities.h"

#define COMPANY_INITIAL_SIZE 20
#define COMENT_INITIAL_SIZE 2
#define SEARCHES_INITIAL_SIZE 20
#define RATING_INITIAL_SIZE 2

#define TEXT_MAX_SIZE 200
#define NAME_MAX_SIZE 50
#define EMAIL_MAX_SIZE 50
#define TITLE_MAX_SIZE 50
#define ADDRESS_MAX_SIZE 70
#define LOCATION_MAX_SIZE 70
#define CATEGORY_MAX_SIZE 30

#define NIF_MIN_SIZE 100000000
#define NIF_MAX_SIZE 999999999


    enum category {
        microCompany = 1, pmeCompany, macroCompany
    };

    enum state {
        inactive, active
    };

    enum searchCamp {
        nif, businessArea, nameLocation
    };

    enum comentState {
        hidden, visible
    };

    typedef struct {
        char title[TITLE_MAX_SIZE];
        char text[TEXT_MAX_SIZE];
        char userName[NAME_MAX_SIZE];
        char userEmail[EMAIL_MAX_SIZE];
        enum comentState states;
    } Coment;

    typedef struct {
        int nota;
        char userName[NAME_MAX_SIZE];
        char userEmail[EMAIL_MAX_SIZE];
    } Rating;

    typedef struct {
        int Nif;
        char name[NAME_MAX_SIZE];
        enum category categories;
        int businessAreaCode;
        enum state states;
        char address[ADDRESS_MAX_SIZE];
        char location[LOCATION_MAX_SIZE];
        int postalCode;
        int comentCounter, comentSize;
        Coment *coments;
        int ratingCounter, ratingSize;
        Rating *ratings;
    } Company;

    typedef struct {
        int counter, size;
        Company *companies;
    } Companies;

    void freeCompanies(Companies *);
    void loadCompanyFile(Companies *, char*);
    void saveCompanyFile(Companies *, char *);
    void insertCompanies(Companies *, Activities *); //<- line that gives the error
    void insertComents(Companies *);
    void insertRatings(Companies *);
    void expandCompanySize(Companies *);
    void searchNifCompanies(Companies);
    void printCompany(Companies, int);
    void editCompanies(Companies *);
    char* getStringCategory(Companies *, int);
    char* getStringState(Companies *, int);
    void searchNameCompanies(Companies);
    void removeCompanies(Companies *);
    void removeComents(Companies *);
    void AlterComentState(Companies *);

#ifdef __cplusplus
}
#endif

文件activities.h在哪里工作:

#ifndef ACTIVITIES_H
#define ACTIVITIES_H

#include "companies.h"

#ifdef __cplusplus
extern "C" {
#endif

#define ACTIVITIES_INITIAL_SIZE 20
    
    typedef struct {
        int activityCode;
        char name[NAME_MAX_SIZE];
        enum state states;
    } Activity;

    typedef struct {
        int activityCounter, size;
        Activity *activities;
    } Activities;
    void loadActivityFile(Activities*,char*);
    void saveActivityFile(Activities*,char*);   
    void insertActivities(Activities*);
    void removeActivities(Activities*, Companies*);
    void editActivities(Activities*);
    void changeActivityState(Activities*);
    int verifyActivityUse(Companies*, Activities*, int);
    

#ifdef __cplusplus
}
#endif

#endif /* ACTIVITIES_H */