Help! Call Open(8) from class TouchScreenKeyboard

[Noob319]

I'm looking to display a soft keyboard for use with ImGui in a unity game, and I know that Open method in the class TouchScreenKeyboard can help me to do that. But when I try to call Open the game crashes. I tried referring to related post but I still can't fix it.

My code:

enum class TouchScreenKeyboardType {
    Default,
    ASCIICapable,
    NumbersAndPunctuation,
    URL,
    NumberPad,
    PhonePad,
    NamePhonePad,
    EmailAddress,
    NintendoNetworkAccount,
    Social,
    Search,
    DecimalPad
};
        
enum class Status {
    Visible,
    Done,
    Canceled,
    LostFocus,
};

struct IntPtr {
    void *m_value;
};

class TouchScreenKeyboard {
    public:
    
    IntPtr m_Ptr;
    
    bool get_active() {
        bool (*get_active_)(TouchScreenKeyboard *keyboard) = (bool (*)(TouchScreenKeyboard *))Method("UnityEngine.CoreModule.dll", "UnityEngine", "TouchScreenKeyboard", "get_active", 0);
        return get_active_(this);
    }
    
    Status get_status() {
        Status (*get_status_)(TouchScreenKeyboard *keyboard) = (Status (*)(TouchScreenKeyboard *))Method("UnityEngine.CoreModule.dll", "UnityEngine", "TouchScreenKeyboard", "get_status", 0);
        return get_status_(this);
    }
    
    String *get_text() {
        String *(*get_text_)(TouchScreenKeyboard *keyboard) = (String *(*)(TouchScreenKeyboard *))Method("UnityEngine.CoreModule.dll", "UnityEngine", "TouchScreenKeyboard", "get_text", 0);
        return get_text_(this);
    }
    
    static TouchScreenKeyboard *Open(String *text, TouchScreenKeyboardType keyboardType, bool autocorrection, bool multiline, bool secure, bool alert, String *textPlaceholder, int characterLimit) {
        TouchScreenKeyboard *(*Open_)(String *text, TouchScreenKeyboardType keyboardType, bool autocorrection, bool multiline, bool secure, bool alert, String *textPlaceholder, int characterLimit) = (TouchScreenKeyboard *(*)(String *, TouchScreenKeyboardType, bool, bool, bool, bool, String *, int))Method("UnityEngine.CoreModule.dll", "UnityEngine", "TouchScreenKeyboard", "Open", 8);
        return Open_(text, keyboardType, autocorrection, multiline, secure, alert, textPlaceholder, characterLimit);
    }
};

I try like this:

ImGui::Begin("Test", nullptr);
if (ImGui::Button("Click Me")) {
    TouchScreenKeyboard *Keyboard = TouchScreenKeyboard::Open(Il2CppString::Create(""), TouchScreenKeyboardType::Default, false, false, false, false, Il2CppString::Create(""),  100);
}
ImGui::End();