GIVE HTTP ERROR WHEN UPLOAD IMAGE

Fatal error: Uncaught exception ‘ImagickException’ with message ‘no decode delegate for this image format `/home2/greenyro/public_html/wp-content/uploads/2015/03/marcaagua1.png’ @ error/constitute.c/ReadImage/544′ in /home2/greenyro/public_html/wp-content/plugins/image-watermark/image-watermark.php:528 Stack trace: #0 /home2/greenyro/public_html/wp-content/plugins/image-watermark/image-watermark.php(528): Imagick->__construct(‘/home2/greenyro…’) #1 /home2/greenyro/public_html/wp-content/plugins/image-watermark/image-watermark.php(492): Image_Watermark->do_watermark(6519, ‘/home2/greenyro…’, ‘medium’, Array) #2 [internal function]: Image_Watermark->apply_watermark(Array, 6519) #3 /home2/greenyro/public_html/wp-includes/plugin.php(235): call_user_func_array(Array, Array) #4 /home2/greenyro/public_html/wp-admin/includes/image.php(209): apply_filters(‘wp_generate_att…’, Array, 6519) #5 /home2/greenyro/public_html/wp-admin/includes/media.php(375): wp_generate_attachment_metadata(6519, ‘/home2/greenyro…’) #6 /home2/gree in /home2/greenyro/public_html/wp-content/plugins/image-watermark/image-watermark.php on line 528

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