论坛无法添加水印

注册验证码可正常使用,
论坛水印功能开启后,
上传图片时提交时在帖子页面跳转上方会提示以下数据:

1. Warning: imagecreatefromgif(): './images/common/watermark.gif' is not a valid GIF file in /home/###/public_html/forum/include/post.func.php on line 135
   
2. 
   
3. Warning: imagesx(): supplied argument is not a valid Image resource in /home/###/public_html/forum/include/post.func.php on line 136
   
4. 
   
5. Warning: imagesy(): supplied argument is not a valid Image resource in /home/###/public_html/forum/include/post.func.php on line 137
   
6. 
   
7. Warning: imagealphablending(): supplied argument is not a valid Image resource in /home/###/public_html/forum/include/post.func.php on line 205
   
8. 
   
9. Warning: imagecopymerge(): supplied argument is not a valid Image resource in /home/###/public_html/forum/include/post.func.php on line 206

复制代码

而且水印无法添加,
不太懂!
请教!!!

post.func.php

我也这样啊,不知道怎么了