[Koha] Koha - reports

[K G]

Shalom,
 
I am trying to produce some statistics reports from "Accounts and Reports". Most of the reports are working properly except below two types: 
 
Catalog Statistics-Catalogue by itemtype  
Circulation Statistics-Issues by borrower categor 
 
I got "500 Internal Server Error" when clicking them. Do you have any ideas? 

Shalom

       
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