Error adding productos after moving to another server

[digitallred]

i´ve moved the entired website using the server backup system, everything was working good but when i try to add or modify products or categories i get this error messaje.

 

Warning: array_merge() [function.array-merge]: Argument #1 is not an array in /home2/semillas/public_html/lamejana/admin/categories.php on line 257

 

Warning: Cannot modify header information - headers already sent by (output started at /home2/semillas/public_html/lamejana/admin/categories.php:257) in /home2/semillas/public_html/lamejana/admin/includes/functions/general.php on line 16

 

the result... it seens to add the product but doesn´t appears

what can i do?

 

thanks for reading guys