Error when running report

My application attempts to run one of my reports that works correctly in Crystal Reports 2008 and gives me an error of:

Error in formula shipmentID:

'if( isNull( {S0102_ShipmentOrder.S0102_CustLoadNbr} ) ) then

'

Too many arguments have been given to this function.

Details: errorKind

The formula is:

if( isNull( {S0102_ShipmentOrder.S0102_CustLoadNbr} ) ) then

(

"";

)

else

(

if( {S0102_ShipmentOrder.S0102_CustCode} = "2158" ) then

(

"BEST BUY LOAD ID: " + {S0102_ShipmentOrder.S0102_CustLoadNbr} +

" BEST BUY DELIVERY DATE " + cstr({S0102_ShipmentOrder.S0102_DueDate}, "MM/dd/yy");

)

else if( {S0102_ShipmentOrder.S0102_CustCode} = "2159" ) then

(

"SRR " + {S0102_ShipmentOrder.S0102_CustLoadNbr};

)

else if( {S0102_ShipmentOrder.S0102_CustCode} = "16038" ) then

(

"Tour or VAS#: " + {S0102_ShipmentOrder.S0102_CustLoadNbr};

)

else if( {S0102_ShipmentOrder.S0102_CustCode} = "19130" ) then

(

"MBOL#: " + {S0102_ShipmentOrder.S0102_CustLoadNbr};

)

else

(

"CID# " + {S0102_ShipmentOrder.S0102_CustLoadNbr};

)

);

Why am i getting this error when i run this report my application?