$Aoh{ testa } = @{ exec_select ($sql ) } [0] ->{ home1 };
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This piece of code basically does the following

• Execute exec_select with $sql as its argument (exec_select($sql))
• Dereference its return value as an array ( @{ ... } )
• Get the first element of this array ( @{ ... } [0] )
• Dereference the array element as a hash ( ->{ ... } )
• Get the key 'home1' from the dereferenced hash ( ->{ home1 } )
• Assign the value stored in the hash with the key 'home1' to $Aoh{testa}

"Can't use an undefined value as a HASH reference..."

This error is caused by the first element in the above array being undefined. Therefor it can't be dereferenced as a hash.

Cheers, Flo