<int:inbound-channel-adapter .... >
<int:interval-trigger fixed-rate=".." />
I guess you need to study the schema or some other detailed documentation.
That's because the schema does not allow the fixed-rate attribute on that element. My guess is that you want this:
thanks for your suggestion Now I am able to allow fixed-rate but getting another exception " http //www.springframework.org/schema/integration advice-chain ' is expected"