Ads not showing up

Hello,

I have a problem with the ads, they do not appear at all in header, sidebar and inline block.

Here is my code for each :
<script async src=”//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js”></script>
<!– Skycraper 300×600 –>
<ins class=”adsbygoogle”
style=”display:inline-block;width:300px;height:600px”
data-ad-client=”ca-pub-XXXXXXXXXXXXXXXX”
data-ad-slot=”XXXXXXXXXX”></ins>
<script>
(adsbygoogle = window.adsbygoogle || []).push({});
</script>

<script async src=”//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js”></script>
<!– Billboard 970×250 –>
<ins class=”adsbygoogle”
style=”display:inline-block;width:970px;height:250px”
data-ad-client=”ca-pub-XXXXXXXXXXXXXXXX”
data-ad-slot=”XXXXXXXXXX”></ins>
<script>
(adsbygoogle = window.adsbygoogle || []).push({});
</script>

<script async src=”//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js”></script>
<!– Rectangle large 336×280 –>
<ins class=”adsbygoogle”
style=”display:inline-block;width:336px;height:280px”
data-ad-client=”ca-pub-XXXXXXXXXXXXXXXX”
data-ad-slot=”XXXXXXXXXX”></ins>
<script>
(adsbygoogle = window.adsbygoogle || []).push({});
</script>

In the header (billboard), it’s just showing a blank 970*250 rectangle. The others ads are showing nothing.

Thanks.