solidity 将数据位置从内存更改为存储

嗨我有这个代码，错误是：

UnimplementedFeatureError：尚不支持将类型 struct spu_university.all_courses 内存 [] 内存复制到存储。

我怎么解决这个问题？？

// SPDX-许可证标识符：麻省理工学院 pragma solidity >=0.4.22 <0.9.0;

合同spu_university {

address  is_admin;
constructor(){
    is_admin = msg.sender;
}

modifier onlyAdmin(address x) {
    require(x== is_admin, "Permission Denied. You do not have admin access.");
    _;  }

uint s_counter=0;

struct students_marks{
    uint id;
    uint mark;
}

struct  all_courses{

    string course_name ;
    uint mark ;
}

struct warning {

    string date ;
    string description;
}

struct  course {
    string name ;
    uint id;
    uint weekly_hours;
    uint level ;

    
    students_marks[] marks;
    }

    struct prof {
    
    uint id ;
    string firstName;
    string lastName;
    string fatherName;
    string motherName;
    string gender;
    string email;
    string collegeName;
    string dateOfBirth;
    string mobileNumber; 
    string specialization ;


}

struct  student  {

    uint  id ;
    string firstName;
    string lastName;
    string fatherName;
    string motherName;
    string gender;
    string email;
    string collegeName;
    string dateOfBirth;
    string mobileNumber;
    
    all_courses[] course;
    
    warning[] s_warnings;
    
    }

student[] studentList ;
prof[] profList;
course[] courselist; 

mapping(uint => student) public getstudent;
mapping(uint => prof) public getprof;   
mapping(uint => course) public getcours; 

//--------------------------------注册函数------------ ------------------------------------------

function registerStudent(
    uint  _id,
    string memory _firstName,
    string memory _lastName,
    string memory _fatherName,
    string memory _motherName,
    string memory _gender,
    string memory _email,
    string memory _collegeName,
    string memory _dateOfBirth,
    string memory _mobileNumber

    ) onlyAdmin(msg.sender) public {

    
          student memory x= student(_id,_firstName,
          _lastName,_fatherName,_motherName,_gender,
          _email,_collegeName,_dateOfBirth,
          _mobileNumber,
          new all_courses[] (0),
          new warning[] (0) );
          
          studentList.push(x);

    getstudent[_id]=studentList[s_counter];
    s_counter ++;
    
}

}

我试了很多东西都不管用