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ADS1299: Ads1299 doesnt work Vcap1 appear -1.1V

Part Number: ADS1299

I am using openbci circuit and insert 5V

My ldo regulator make 3v DVDD and 2.5v Avdd -2.5 avss

But VCAP1 appear -1.1 when i see datasheet that appear when i start power on and reset. I must waiting for VCAP1 above 1.1 V

But my circuit VCAP1 is -1.1v (minus)

So i dont know why.. please help me