Uncaught Error: Template parse errors is not a known element

compiler.js: 2547 Uncaught Error: Template parse errors:
    'app-login-box'
is not a known element:
    1. If 'app-login-box'
is an Angular component, then verify that it is part of this module.
2. If 'app-login-box'
is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA'
to the '@NgModule.schemas'
of this component to suppress this message.(" < /div> < /main> --> [ERROR - > ] < app - login - box >
        test error mission export module < /app-login-box>"): ng:/ //AppModule/LoginComponent.html@66:0
        at syntaxError(compiler.js: 2547) at TemplateParser.push.. / node_modules / @angular / compiler / fesm5 / compiler.js.TemplateParser.parse(compiler.js: 19495) at JitCompiler.push.. / node_modules / @angular / compiler / fesm5 / compiler.js.JitCompiler._parseTemplate(compiler.js: 25041) at JitCompiler.push.. / node_modules / @angular / compiler / fesm5 / compiler.js.JitCompiler._compileTemplate(compiler.js: 25028) at compiler.js: 24971 at Set.forEach( < anonymous > ) at JitCompiler.push.. / node_modules / @angular / compiler / fesm5 / compiler.js.JitCompiler._compileComponents(compiler.js: 24971) at compiler.js: 24881 at Object.then(compiler.js: 2538) at JitCompiler.push.. / node_modules / @angular / compiler / fesm5 / compiler.js.JitCompiler._compileModuleAndComponents(compiler.js: 24880)