Generated blocks, but no rewards

Hi there. I’m operating a stake pool on preview testnet and studying it.

My pool have been generating blocks for some epochs, but the operator and delegators can’t receive rewards.

Could anyone let me know what I should check?

https://preview.cexplorer.io/pool/pool1nhkfauluxw5xlwjz96arvfjtl4c92x2wxas6jvh8rr2s560d9vy/rewards#data

I solved this problem by myself.
I’m sorry for the trouble.