ng build -prod errors with 1.7.0-RC.0

Versions

Angular CLI: 1.7.0-rc.0 Node: 9.5.0 OS: win32 x64 Angular: 5.2.1 … animations, common, compiler, compiler-cli, core, forms … http, language-service, platform-browser … platform-browser-dynamic, router

@angular/cdk: 5.1.0 @angular/cli: 1.7.0-rc.0 @angular/flex-layout: 2.0.0-beta.10-4905443 @angular/material-moment-adapter: 5.1.0 @angular/material: 5.1.0 @angular-devkit/build-optimizer: 0.3.1 @angular-devkit/core: 0.3.1 @angular-devkit/schematics: 0.3.1 @ngtools/json-schema: 1.2.0 @ngtools/webpack: 1.10.0-rc.0 @schematics/angular: 0.3.1 @schematics/package-update: 0.3.1 typescript: 2.4.2 webpack: 3.10.0

Repro steps

• ng build -prod

Observed behavior

<!-- Normally this includes a stack trace and some more information. -->
..\node_modules\enhanced-resolve\lib\CachedInputFileSystem.js:40
                callbacks[i](err, result);
                            ^

TypeError: callbacks[i] is not a function

### Desired behavior
Application compiled without any error


### Mention any other details that might be useful (optional)
It was working fine with 1.7.0-beta.3

[surajjadhav720]

npm install copy-webpack-plugin@4.3.0 is solved the problem

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