WASM: Uncaught (in promise) TypeError: Import #0 module=“env” error: module is not an object or function Promise.then (async) (anonymous) @ (index):9

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I'm new to emscripten and find it very hard... I have obligation to work on windows because i have to test .exe versions of my apps. I'm on windows 7.

I can compile wasm but javascript cannot read it. Here's my code.

C code:

char * HelloWorld ()
{
    return "Hello World !";
}

Emscripten command-line:

emcc hello.c -O2 -s ONLY_MY_CODE=1 -s WASM=1 -s SIDE_MODULE=1 -s EXPORTED_FUNCTIONS="['_HelloWorld']" -o hello.wasm

Wat result:

(module
  (type $t0 (func (result i32)))
  (type $t1 (func))
  (import "env" "memory" (memory $env.memory 256))
  (import "env" "memoryBase" (global $env.memoryBase i32))
  (func $_HelloWorld (export "_HelloWorld") (type $t0) (result i32)
    (get_global $env.memoryBase))
  (func $__post_instantiate (export "__post_instantiate") (type $t1)
    (set_global $g1
      (i32.add
        (get_global $env.memoryBase)
        (i32.const 16)))
    (set_global $g2
      (i32.add
        (get_global $g1)
        (i32.const 5242880))))
  (global $g1 (mut i32) (i32.const 0))
  (global $g2 (mut i32) (i32.const 0))
  (data (get_global $env.memoryBase) "Hello World !"))

Javascript:

importObject = {};

fetch('hello.wasm').then(response =>
  response.arrayBuffer()
).then(bytes =>
  WebAssembly.instantiate(bytes, importObject)
).then(results => {
  console.log("loaded");
});

Error message:

Uncaught (in promise) TypeError: Import #0 module="env" error: module is not an object or function
Promise.then (async)
(anonymous) @ (index):9

Can you tell me what's wrong in my code ?