"error: failed to select a version for `parity-util-mem`"

Question

Currently dealing with an issue building my chain where parity-util-mem is conflicting with parity-util-mem-ban duplicates and I don't know the exact way to specify a certain version for all dependencies to use as I installed lots of pallets. Here is the full error just for reference

Updating crates.io index
Updating git repository `https://github.com/substrate-developer-hub/pallet-did`

error: failed to select a version for parity-util-mem.

... required by package `sp-core v3.0.0`
... which satisfies dependency `sp-core = "^3.0.0"` of package `frame-support v3.0.0`
... which satisfies dependency `frame-support = "^3.0.0"` of package `frame-system v3.0.0`
... which satisfies dependency `frame-system = "^3.0.0"` of package `pallet-did v3.0.0 (https://github.com/substrate-developer-hub/pallet-did#8510c92b)`
... which satisfies git dependency `did` of package `node-template-runtime v2.0.0 (C:\Users\throwaway\Documents\GitHub\Argonaut-Chain\runtime)`
... which satisfies path dependency `node-template-runtime` (locked to 2.0.0) of package `node-template v2.0.0 (C:\Users\throwaway\Documents\GitHub\Argonaut-Chain\node)`

versions that meet the requirements ^0.9.0 are: 0.9.0

the package parity-util-mem links to the native library parity-util-mem-ban-duplicates, but it conflicts with a previous package which links to parity-util-mem-ban-duplicates as well: package parity-util-mem v0.7.0

... which satisfies dependency `parity-util-mem = "^0.7"` of package `kvdb v0.7.0`
... which satisfies dependency `kvdb = "^0.7.0"` (locked to 0.7.0) of package `sc-client-api v2.0.0`
... which satisfies dependency `sc-client-api = "^2.0.0"` (locked to 2.0.0) of package `node-template v2.0.0 (C:\Users\throwaway)\Documents\GitHub\Argonaut-Chain\node)`

Only one package in the dependency graph may specify the same links value. This helps ensure that only one copy of a native library is linked in the final binary. Try to adjust your dependencies so that only one package uses the links ='parity-util-mem' value. For more information, see https://doc.rust-lang.org/cargo/reference/resolver.html#links.

failed to select a version for parity-util-mem which could resolve this conflict

Answer 1

This mostly happens when updating the polkadot version and you have still an old conflicting polkadot dependency.

Try to stay consistent for each my-pallet/Cargo.toml version

For example when you use the following.

frame-support = { default-features = false, version = "4.0.0-dev", git = "https://github.com/paritytech/substrate.git", branch = "polkadot-v0.9.22"}

Then you should always stay with the branch polkadot-v0.9.22.

It seams, that your node-template-runtime is v2.0.0, which has conflicting dependencies to your pallet pallet-did.

Answer 2

Checkout cargo tree, then you can easier see what versions are being used https://doc.rust-lang.org/cargo/commands/cargo-tree.html