资源中心无法显示缩略图,是GD库版本问题吗?

[mqjhz]

系统:RedHat9,
GD库:
GD Support enabled
GD Version 1.6.2 or higher
FreeType Support enabled
FreeType Linkage with freetype
JPG Support enabled
PNG Support enabled
WBMP Support enabled

但启用缩略图后,出现如下错误:
Exception message: imagecreatetruecolor(): requires GD 2.0 or later
Error code: 2
Stack trace is not available

Exception message: imagecreatetruecolor(): requires GD 2.0 or later
Error code: 2
Stack trace is not available

Exception message: Cannot add header information - headers already sent by (output started at /home/www/plog/class/object/exception.class.php:37)
Error code: 2
Stack trace is not available

Exception message: Cannot add header information - headers already sent by (output started at /home/www/plog/class/object/exception.class.php:37)
Error code: 2
Stack trace is not available
是不是GD库的版本问题啊?