C++ native plugin Failed with error '%1 is not a valid Win32 application

Hello,

I have been trying to get a native plugin written in C++ to work in Unity. This is my first time writing such a plugin, so I was playing around with some test code to see if I could get it working. However, I am running into an issue I can't wrap my head around. Unity reports an error with the use of my plugin whenever I use a C++ style convention, like new (I have no experience writing code in C, so apologies if that statement is not true).

Below is the C++ code I am using:

 #define UNITY_EXPORT __declspec(dllexport)    
 int value = 0;    
 class AA {
 public:
     int index;
 };    
 static AA* aaa = 0;
 
 static void DoInit(){
     aaa = new AA();
 }
 
 extern "C" {
     UNITY_EXPORT void A(int x){
         value = x;
     }
     UNITY_EXPORT int B(){
         return value;
     }    
     UNITY_EXPORT void Init(){
         DoInit();
     }
 }

And this is the MonoBehaviour script: public class TestDLL : MonoBehaviour {

     [DllImport("libUnitySimpleTest", EntryPoint="A")]
     public static extern void A(int x);
 
     [DllImport("libUnitySimpleTest", EntryPoint="B")]
     public static extern int B();
 
     [DllImport("libUnitySimpleTest", EntryPoint="Init")]
     public static extern void Init();
 
     // Use this for initialization
     void Start () {
         Init ();
     }
     
     // Update is called once per frame
     void Update () {
         A (2);    
         int r = B ();
         transform.position = new Vector3 (r, 0.5f, 0);
     }
 }

The error message is: "Failed to load 'Assets/Plugin/[pluginname].dll' with error '%1 is not a valid Win32 application.

After a lot of trial and error, I figured out that this error happens when I do the "aaa = new AA();" call. If I comment this line, it works fine. Likewise, if I try to for example create a char* array using the new keyword, the error appears, but creating the array using malloc() works fine.

Any idea why this happens or how I can fix it?

If it matters, I am not using the Pro version of Unity.

Thanks in advance.

Yme