Cabal build Cardano node error

Hi, after trigering this command I recived error. Is any idea how to fix it guys.

cabal build cardano-cli cardano-node

Warning: Requested index-state 2021-03-15T00:00:00Z is newer than’! Falling back to older state (2021-03-14T23:47:09Z).

Resolving dependencies…

cabal: Could not resolve dependencies:

[__0] trying: Win32-network- (user goal)

[__1] trying: base- (dependency of Win32-network)

[__2] next goal: byron-spec-chain (user goal)

[__2] rejecting: byron-spec-chain- (conflict:

base==, byron-spec-chain => base>=4.11 && <4.15)

[__2] fail (backjumping, conflict set: base, byron-spec-chain)

After searching the rest of the dependency tree exhaustively, these were the

goals I’ve had most trouble fulfilling: base, Win32-network, byron-spec-chain

similar issue here:

I solved the problem.

how did you solve the problem? mine hasn’t been resolved

you have to install ghc 8.10.4 do not upgrade to version 9.1.0