[Solved] what is the error in javascripts i had already define the function but it could not find the defination

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Firstable as I say convWt() is not the same as convWT().
Then, you should never give the same id to each of your input.
Try to make this like :

var inp = document.getElementById('inp');
var convGram = document.getElementById('convGram');
var convPound = document.getElementById('convPound');
var convMiliGram = document.getElementById('convMiliGram');
var convTon = document.getElementById('convTon');
var convOunce = document.getElementById('convOunce');


function convWt() {
  var val = inp.value;
  
  convGram.value = parseFloat(val * 1000);
  convPound.value = parseFloat(val * 2.2046);
  convMiliGram.value = parseFloat(val * 1000000);
  convTon.value = parseFloat(val * 0.0011023);
  convOunce.value = parseFloat(val * 35.274);
}
<center>
  <h1>Weight Converter</h1>
</center>
<center>
  <p>Welcome To Online Weight Converter</p>
</center>

<center><label>Weight In Kg:</label>
  <form id="myForm">

    <input id="inp" type="number" />
    <input type="button" value="convert" onclick="convWt()" />

    <table>

      <tr>
        <td>Weight In Grams:</td>
        <td><input id="convGram" /></td>
      </tr>
      <tr>
        <td>Weight In Pound</td>
        <td><input id="convPound" /></td>
      </tr>
      <tr>
        <td>MiliGram:</td>
        <td><input type="text" id="convMiliGram" /></td>
      </tr>
      <tr>
        <td>Us Ton:</td>
        <td><input type="text" id="convTon" /></td>
      </tr>
      <tr>
        <td>Ounces:</td>
        <td><input id="convOunce"></td>
      </tr>
      <tr>
        <td><input type="button" value="Rest Form" onclick="document.getElementById('myForm').reset()" /></td>
      </tr>
    </table>
  </form>
  <p><b/> You Can Press Reset Button For Another Conversion
  </p>
</center>

It’s longer to write, yes, but it’s at best.

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solved what is the error in javascripts i had already define the function but it could not find the defination