Trouble with creating first Substrate chain - blockchain

Question

When I try to compile the Node Template I get a series of errors.
error: failed to run custom build command for node-template-runtime v2.0.0 (/Users/Modulus3D/VSCode Projects/substrate-node-template/runtime)
Caused by:
process didn't exit successfully: /Users/Modulus3D/VSCode Projects/substrate-node-template/target/release/build/node-template-runtime-cae9ad6029c9f681/build-script-build (exit code: 1)
--- stdout
Executing build command: "rustup" "run" "nightly" "cargo" "rustc" "--target=wasm32-unknown-unknown" "--manifest-path=/Users/Modulus3D/VSCode Projects/substrate-node-template/target/release/wbuild/node-template-runtime/Cargo.toml" "--color=always" "--release"
and also:
error[E0282]: type annotations needed
--> /Users/Modulus3D/.cargo/registry/src/github.com-1ecc6299db9ec823/sp-arithmetic-2.0.0/src/fixed_point.rs:541:9
|
541 | let accuracy = P::ACCURACY.saturated_into();
| ^^^^^^^^ consider giving accuracy a type
...
1595 | / implement_fixed!(
1596 | | FixedI64,
1597 | | test_fixed_i64,
1598 | | i64,
... |
1601 | | "Fixed Point 64 bits signed, range = [-9223372036.854775808, 9223372036.854775807]",
1602 | | );
| |__- in this macro invocation
|
= note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
error[E0282]: type annotations needed
--> /Users/Modulus3D/.cargo/registry/src/github.com-1ecc6299db9ec823/sp-arithmetic-2.0.0/src/fixed_point.rs:541:9
|
541 | let accuracy = P::ACCURACY.saturated_into();
| ^^^^^^^^ consider giving accuracy a type
...
1604 | / implement_fixed!(
1605 | | FixedI128,
1606 | | test_fixed_i128,
1607 | | i128,
... |
1611 | | [-170141183460469231731.687303715884105728, 170141183460469231731.687303715884105727]_",
1612 | | );
| |__- in this macro invocation
|
= note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
error[E0282]: type annotations needed
--> /Users/Modulus3D/.cargo/registry/src/github.com-1ecc6299db9ec823/sp-arithmetic-2.0.0/src/fixed_point.rs:541:9
|
541 | let accuracy = P::ACCURACY.saturated_into();
| ^^^^^^^^ consider giving accuracy a type
...
1614 | / implement_fixed!(
1615 | | FixedU128,
1616 | | test_fixed_u128,
1617 | | u128,
... |
1621 | | [0.000000000000000000, 340282366920938463463.374607431768211455]_",
1622 | | );
| |__- in this macro invocation
|
= note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
error: aborting due to 3 previous errors
For more information about this error, try rustc --explain E0282.
error: could not compile sp-arithmetic
To learn more, run the command again with --verbose.
warning: build failed, waiting for other jobs to finish...
error: build failed
warning: build failed, waiting for other jobs to finish...
error: build failed
Any suggestions on how to resolve these errors??

Answer 1

Look like you need to downgrade you nightly version.
You can do so by running the following sequence of commands:
rustup install nightly-2020-10-06
rustup target add wasm32-unknown-unknown --toolchain nightly-2020-10-06
export WASM_BUILD_TOOLCHAIN=nightly-2020-10-06
You can learn more about how nightly is used with substrate here: https://substrate.dev/docs/en/knowledgebase/getting-started/#rust-nightly-toolchain

Answer 2

Fresh project always facing the efferent nightly versions issue.
If you running the substrate version 2.0.0 you can solve it with bellow command:
rustup install nightly-2020-07-02
rustup override set nightly-2020-07-02
rustup target add wasm32-unknown-unknown --toolchain nightly-2020-07-02
then try to re build again!