tensorrt5.1 pool1:expected 1 tops blobs, found 2 error parsing layer type Pooling index 5

when I change the caffemodel to tensorRT model, I met the error.How can I fix this error?

the layer like this:
layer {
name: “pool1”
type: “Pooling”
bottom: “conv1_2”
top: “pool1”
top: “pool1_mask”
pooling_param {
pool: MAX
kernel_size: 2
stride: 2
}
}

and the error is:
pool1:expected 1 tops blobs, found 2
error parsing layer type Pooling index 5