I have started to study Substrate recently, and encountered a lot of simple but not-so-easy to solve errors. So I decided to make a list of them, for future use and for others)
error[E0432]: unresolved import
pallet
This is compile error caused by errors in
pub mod pallet { <fix errors here> }
error: failed to download
parity-db v0.2.2
can be resolved by:
cargo update -p parity-db
- many errors while building substrate-node-template often can be resolved with
cargo update -p <package causing problem>
- error
.iter().map(|x| x.amount).sum();
the trait `Sum<<T as pallet_*::Config>::Balance>` is not implemented for `&<T as pallet_*::Config>::Balance`
can be resolved by using
.fold(T::Balance::default(), |acc, x| acc + x);
instead of .sum()
OR if u use custom asset pallet and can make changes in it, adding trait Sum<Self::Balance>
to Balance let u use .sum()
/// The units in which we record balances.
type Balance: Member + Parameter + AtLeast32BitUnsigned + Default + Copy + Sum<Self::Balance>;
- error 1002 (in polkadot.js.org/apps/)
1002: Verification Error: Runtime error: Execution failed: ApiError("Could not convert parameter
tx
between node and runtime: Could not decodeCall::MyPallet.0
:\n\tCould not decodeCall::create.3
:\n\t\tNot enough data to fill buffer\n")
This error appears because of wrong types.json - wrong type here: Call::create.3
- 3rd argument with start from 0 (0,1,2,3)
- error
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