I was making parity-bridges-common compatible to the stable version of polkadot-v0.9.32. I'm getting the error:

expected struct Weight , found integer.

Because earlier the weight in the frame-support was u64 but now it`s struct Weight

struct Weight
    /// The weight of computational time used based on some reference hardware.
    ref_time: u64,
    /// The weight of storage space used by proof of validity.
    proof_size: u64,

Can someone please guide me through this.

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2 Answers 2


You should convert u64 to Weight struct

Try this from_parts method :https://paritytech.github.io/substrate/master/src/sp_weights/weight_v2.rs.html#118


Weight::from_parts(25_000_000, u64::MAX)


Since weight is now two dimensional, you need to provide a Proof size component as well.
The exact value for this depends on the use-case; exactly like the exact Reference Time component depends on the use-case. u64::MAX should just be a place holder and not a default value.

You can then use Weight::from_parts instead of a simple u64 to construct a Weight instance.

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