[exim] problem with spam acl

Hi!

i'm getting the following errormessage while scanning larger messages:

temporarily rejected after DATA: failed to expand ACL string "${if
>{$spam_score_int}{40}{1}{0}}": integer expected but "" found


my ACL is:

 # Always add X-Spam-Score and X-Spam-Report headers, using SA system-wide 
settings
  # (user "exim")
    warn  message = X-Spam-Score: $spam_score ($spam_bar)
              condition = ${if <{$message_size}{500k}{1}{0}}
              spam = exim:true
    warn  message = X-Spam-Report: $spam_report
              condition = ${if >{$spam_score_int}{40}{1}{0}}
              spam = exim:true
  # Add X-Spam-Flag if spam is over system-wide threshold
    warn message = X-Spam-Flag: YES
          condition = ${if <{$message_size}{500k}{1}{0}}
          spam = exim

  # Reject spam messages with score over 5, using an extra condition.
    deny  message = SPAM This message scored $spam_score SPAM points.
          condition = ${if >{$spam_score_int}{50}{1}{0}}
          spam = exim:true

Who can help please ?
Wolfgang

----------------------------------------------------------------------
Wolfgang Fuertbauer (e-Mail: Wolfgang.Fuertbauer@???)
EBEWE Pharma                          
Mondseestrasse 11                     
4866  Unterach, Austria
Tel +43 7665 8123 315    Mobile: +43 664 8397987
Fax +43 7665 8123 1487
http://www.ebewe.com