php thumbnail script wont show watermark image and text

[Pravesh_1]

I am using phpThumb class to generate thumb image and watermark image/text; I am getting thumbnail image successfully but not able to write any watermark text or image.

<img src="phpThumb.php?src=<?php echo $row['user_profileid']; ?>/<?php echo $profile['photo_name']; ?>&w=144&h=173&fltr[]=wmi|watermark.png|BL" alt="" class="profile-pic">

I have to change in config file to show watermark ??

[pritaeas]

Is the watermark image available and path correct? Do you have GD enabled?

[Pravesh_1]

yes.. image is available and GD is also enabled

[pritaeas]

If you type the URL in the address bar directly, what do you see? Do you have errors enabled?

[Pravesh_1]

Showing thumbnail image but not with watermark text or image.