ZenCart 后台上传图片出现Cannot Initialize new GD image stream，一看到这个提示就知道与GD库有关，查看了下空间配置已经支持GD库，那该怎么解决呢。

还有一大串提示：

Warning: imagecreatetruecolor() [function.imagecreatetruecolor]: Invalid image dimensions in public_html/admin/includes/modules/new_product_preview.php on line 80

Warning: imagecolorallocate(): supplied argument is not a valid Image resource in /public_html/admin/includes/modules/product_preview.php on line 81

Warning: imagefill(): supplied argument is not a valid Image resource in /public_html/admin/includes/modules/product_preview.php on line 82

Warning: imagecopyresized(): supplied argument is not a valid Image resource in /public_html/admin/includes/modules/product_preview.php on line 90

Warning: imagejpeg(): supplied argument is not a valid Image resource in /public_html/admin/includes/modules/product_preview.php on line 94

Warning: imagecolorallocate(): supplied argument is not a valid Image resource in /public_html/admin/includes/modules/product_preview.php on line 120

Warning: imagefill(): supplied argument is not a valid Image resource in /public_html/admin/includes/modules/product_preview.php on line 121

Warning: imagecopyresized(): supplied argument is not a valid Image resource in /public_html/admin/includes/modules/product_preview.php on line 129

Warning: imagecopymerge(): supplied argument is not a valid Image resource in /public_html/admin/includes/modules/product_preview.php on line 135
Cannot Initialize new GD image stream

网上搜索了一翻，终于找到了答案：
原因是：admin/includes/modules/new_product_preview.php 文件中的
$im_s = @imagecreatetruecolor( PRODUCT_MEDIUM_SMALL_WIDTH, PRODUCT_MEDIUM_SMALL_HEIGHT ) or die(“Cannot Initialize new GD image stream”);这行代码中的 PRODUCT_MEDIUM_SMALL_WIDTH, PRODUCT_MEDIUM_SMALL_HEIGHT的值没有读取到，是非法值。
解决方案：删除此代码中的or die(“Cannot Initialize new GD image stream”);
重新打开后台看了下，终于可以了！