php error happened

Technical information
Error type 2
Error description array_slice() expects parameter 1 to be array, null given
URL latiaresourcecenter.org/latia/dreport.php?
Error file /home/david21/public_html/latia/dreport.php
Error line 663
SQL query select `GroupID`, `Label` from `latia_uggroups` order by `Label`

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