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AD7528 zero problem

I have a problem with the AD7528 on my first test board .   I'm using a 5v supply and (vref= sine wave vpp=5v) and I'm trying to use it in bipolar mode exactly the same schematic in the data sheet with two external op amps(LF412).  The input of DAC_A is loaded with a binary code 1000 0000.but the output of second opamp shows me 200 mv pick to pick instead of 0 volt. and i cant adjust it with pots and make it zero.

what can be wrong?

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