Error Building Angular App

We're having troubles building the app in azure devops pipelines. It worked perfectly but - without changeing - it fails. The error-message points at some MDB-stuff. Any idea?

ERROR in ./node_modules/ng-uikit-pro-standard/assets/scss/mdb.scss Module build failed (from ./node_modules/mini-css-extract-plugin/dist/loader.js): ModuleBuildError: Module build failed (from ./node_modules/postcss-loader/src/index.js): Error: Failed to find '@angular/cdk/overlay-prebuilt.css' in [ /home/vsts/work/1/s/node_modules/ng-uikit-pro-standard/assets/scss ] at resolveModule.catch.catch (/home/vsts/work/1/s/node_modules/postcss-import/lib/resolve-id.js:35:13) at runLoaders (/home/vsts/work/1/s/node_modules/webpack/lib/NormalModule.js:316:20) at /home/vsts/work/1/s/node_modules/loader-runner/lib/LoaderRunner.js:367:11 at /home/vsts/work/1/s/node_modules/loader-runner/lib/LoaderRunner.js:233:18 at context.callback (/home/vsts/work/1/s/node_modules/loader-runner/lib/LoaderRunner.js:111:13) at Promise.resolve.then.then.catch (/home/vsts/work/1/s/node_modules/postcss-loader/src/index.js:208:9) ERROR in The target entry-point "ng-uikit-pro-standard" has missing dependencies: - @angular/cdk/overlay - @angular/cdk/portal - @angular/cdk/a11y