Errors occurred during the build. Errors running builder 'JavaScript Validator' on project '##'. java.lang.NullPointerException要解決這個問題,要就把JavaScript Validator去掉。去掉的方法是: 選擇一個項目—-右鍵Properties—-Builders(排二個)—-點一下右則會有四項—-取消第一項「JavaScript Validator」的勾就OK了