Schema validation failed with the following errors Data path builders app-shell should have required property class

Question

Schema validation failed with the following errors    Data path   builders  app-shell    should have required property  class    Schema validation failed with the following errors    Data path   builders  app-shell    should have required property  class   Error  Schema validation failed with the following errors    Data path   builders  app-shell    should have required property  class       at MergeMapSubscriber  registry compile pipe operators 1 concatMap validatorResult  as project   D  repo beauty-velvettes-web node modules  angular cli node modules  angular-devkit core src workspace workspace js 210 42      at MergeMapSubscriber  tryNext  D  repo beauty-velvettes-web node modules  angular cli node modules rxjs internal operators mergeMap js 65 27      at MergeMapSubscriber  next  D  repo beauty-velvettes-web node modules  angular cli node modules rxjs internal operators mergeMap js 55 18      at MergeMapSubscriber Subscriber next  D  repo beauty-velvettes-web node modules  angular cli node modules rxjs internal Subscriber js 64 18      at MergeMapSubscriber notifyNext  D  repo beauty-velvettes-web node modules  angular cli node modules rxjs internal operators mergeMap js 84 26      at InnerSubscriber  next  D  repo beauty-velvettes-web node modules  angular cli node modules rxjs internal InnerSubscriber js 25 21      at InnerSubscriber Subscriber next  D  repo beauty-velvettes-web node modules  angular cli node modules rxjs internal Subscriber js 64 18      at MapSubscriber  next  D  repo beauty-velvettes-web node modules  angular cli node modules rxjs internal operators map js 52 26      at MapSubscriber Subscriber next  D  repo beauty-velvettes-web node modules  angular cli node modules rxjs internal Subscriber js 64 18      at SwitchMapSubscriber notifyNext  D  repo beauty-velvettes-web node modules  angular cli node modules rxjs internal operators switchMap js 77 26

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Opened package json Changed   angular-devkit build-angular     0 800 0  to   angular-devkit build-angular     0 10 0  or changed Changing from   angular-devkit build-angular     0 802 1      to   angular-devkit build-angular     0 13 9  Run npm install Run ng serve   The original version can be diferent  but is necessary change it at 0 10 0 or 0 13 9 version that fix the problem

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This worked for me  In package json Changed  quot  angular-devkit build-angular quot    quot  0 800 0 quot  -- gt   quot  angular-devkit build-angular quot    quot  0 10 0 quot  Then   npm install  ng serve  Specs  Angular CLI  6 1 5 Node  10 15 3 OS  win32 x64 Angular  6 1 9

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open cmd from current project  npm uninstall  angular-devkit build-angular npm install --save-dev  angular-devkit build-angular

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Update  angular-devkit build-angular to  quot  0 13 9 quot    Then run npm install and after that  run npm serve  Specs  Angular  7 2 15 Angular CLI  7 3 9  Node  11 2 0  OS  darwin x64

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Most of the answers are correct in stating that this occurs either because of a mismatch between   Nodejs version and Angular version  OR   angular-devkit build-angular version and angular version  Also  this issue is most likely to occur if you either   upgraded downgraded Nodejs version  which is no longer compatible with the angular version   Upgraded Angular version  Run npm audit fix   For 1  check the Nodejs version support needed here  https   angular io guide setup-local and check the installed version  If you are using the latest version of angular  you should be able to make it work with the latest version of Nodejs  For 2  did you follow instructions here  https   update angular io    If yes  and still have issues  look for any issues already created or create an issue here  https   github com angular angular issues For 3  npm audit fix updates the  angular-devkit build-angular version to a higher version because  angular-devkit build-angular does not follow proper versioning  major releases still update only the minor version   Check the link below to check the compatible version for your Angular version  https   www npmjs com package  angular-devkit build-angular activeTab versions Use the correct version and the issue will be fixed  P S  This is a good read about angular versioning  https   angular io guide releases

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I have to say  if you don t want to change anything in package json file  try to update your Node js version to latest   currently 12 13 1 LTS

User · Answer

This will do the trick for you    Update your angular cli by running the command ng update  angular cli  angular core Run or build your project by running the commands ng s or ng build respectively

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What i did was to uninstall and install the   0 13 0   I confirm  support this last  answer  It worked for me as well  I had uninstall version   0 800 0  and installed the   0 13 0   rebuild your project it will work fine

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Below worked for me   gt  1  npm uninstall  angular-devkit build-angular    gt  2  npm install  angular-devkit build-angular 0 13 0  if we use AVOID     npm audit fix -f it may create problem  so dont use it

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This is worked for me   npm uninstall  angular-devkit build-angular npm install  angular-devkit build-angular 0 13 0

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Just found this answer from another link    npm uninstall  angular-devkit build-angular npm install  angular-devkit build-angular 0 13 0

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Try to update  angular core using ng update  angular cli  angular core

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I got this issue when installing Bootstrap   The following commands are what worked for me   npm uninstall  angular-devkit build-angular  npm install  angular-devkit build-angular 0 13 0

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Angular Cli 8 support Node Js 10 9   After update Node js to 10 16 works fine

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Try to update the package json file so that   angular-devkit build-angular     0 800 1  reads   angular-devkit build-angular     0 12 4   Then run npm install in the command line   Reference  https   stackoverflow com a 56537342

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This worked for me   npm uninstall  angular-devkit build-angular  npm install  angular-devkit build-angular 0 13 0

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I got the same error when upgraded angular from 6 to 8   Simple update angular cli to latest version  amp  node version to 10    1  Visit this link to get the latest node version  Angular 8 requires 10   2  Execute npm i   angular cli latest to update cli    This is what I have currently

[angular] Schema validation failed with the following errors: Data path ".builders['app-shell']" should have required property 'class'

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