ERROR in Unable to write a reference to HeaderPanelComponent in .../github/m-eso/libs/shared/modules/core/src/lib/components/header-panel/header-panel.component.ts from .../github/m-eso/libs/shared/modules/core/src/lib/core.module.ts

Angular CLI: 9.1.4
Node: 12.13.1
OS: win32 x64

Angular: 9.1.4
... animations, cli, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router
Ivy Workspace: Yes

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect: 0.901.4
@angular-devkit/architect-cli: 0.901.4
@angular-devkit/build-angular: 0.901.4
@angular-devkit/build-optimizer: 0.901.4
@angular-devkit/build-webpack: 0.901.4
@angular-devkit/core: 9.1.4
@angular-devkit/schematics: 9.1.4
@angular-devkit/schematics-cli: 0.901.4
@angular/cdk: 9.2.2
@ngtools/webpack: 9.1.4
@schematics/angular: 9.1.4
@schematics/schematics: 0.901.4
@schematics/update: 0.901.4
rxjs: 6.5.5
typescript: 3.8.3
webpack: 4.42.0

info it worked if it ends with ok
1 verbose cli [
1 verbose cli   'C:\\NodeJS\\node.exe',
1 verbose cli   'C:\\NodeJS\\node_modules\\npm\\bin\\npm-cli.js',
1 verbose cli   'run',
1 verbose cli   'stage'
1 verbose cli ]
2 info using npm@6.12.1
3 info using node@v12.13.1
4 verbose run-script [ 'prestage', 'stage', 'poststage' ]
5 info lifecycle m-eso@0.0.0~prestage: m-eso@0.0.0
6 info lifecycle m-eso@0.0.0~stage: m-eso@0.0.0
7 verbose lifecycle m-eso@0.0.0~stage: unsafe-perm in lifecycle true
...
9 verbose lifecycle m-eso@0.0.0~stage: CWD: C:\Data\WAMP\github\m-eso
10 silly lifecycle m-eso@0.0.0~stage: Args: [ '/d /s /c', 'ng build --configuration=staging' ]
11 silly lifecycle m-eso@0.0.0~stage: Returned: code: 1  signal: null
12 info lifecycle m-eso@0.0.0~stage: Failed to exec stage script
13 verbose stack Error: m-eso@0.0.0 stage: `ng build --configuration=staging`
13 verbose stack Exit status 1
13 verbose stack     at EventEmitter.<anonymous> (C:\Utils\NVM\v12.13.1\node_modules\npm\node_modules\npm-lifecycle\index.js:332:16)
13 verbose stack     at EventEmitter.emit (events.js:210:5)
13 verbose stack     at ChildProcess.<anonymous> (C:\Utils\NVM\v12.13.1\node_modules\npm\node_modules\npm-lifecycle\lib\spawn.js:55:14)
13 verbose stack     at ChildProcess.emit (events.js:210:5)
13 verbose stack     at maybeClose (internal/child_process.js:1021:16)
13 verbose stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:283:5)
14 verbose pkgid m-eso@0.0.0
15 verbose cwd C:\Data\WAMP\github\m-eso
16 verbose Windows_NT 10.0.18363
17 verbose argv "C:\\NodeJS\\node.exe" "C:\\NodeJS\\node_modules\\npm\\bin\\npm-cli.js" "run" "stage"
18 verbose node v12.13.1
19 verbose npm  v6.12.1
20 error code ELIFECYCLE
21 error errno 1
22 error m-eso@0.0.0 stage: `ng build --configuration=staging`
22 error Exit status 1
23 error Failed at the m-eso@0.0.0 stage script.
23 error This is probably not a problem with npm. There is likely additional logging output above.
24 verbose exit [ 1, true ]