我只是在Ember中建立一个项目，所以遇到了这个问题。它不会消失。我检查了很多论坛。
我在运行ember server时遇到此错误
Cannot start a build if one is already running
Stack Trace and Error Report: /var/folders/gg/_8df84q97d9bv3hvcky3sj1c0000gn/T/error.dump.9aec39b1e1cb7d4551398e66431a9697.log
Build successful (5256ms) – Serving on http://localhost:4200/
Slowest Nodes (totalTime => 5% ) | Total (avg)
----------------------------------------------+---------------------
BroccoliRollup (6) | 1152ms (192 ms)
SassCompiler (1) | 1086ms
Babel: @ember/test-helpers (2) | 550ms (275 ms)
Package /assets/vendor.js (1) | 391ms
ember-auto-import-analyzer (3) | 382ms (127 ms)
broccoli-persistent-filter:EslintValid... (2) | 285ms (142 ms)
(node:5414) UnhandledPromiseRejectionWarning: Error: Cannot start a build if one is already running
at Builder.build (/Users/freakyspeedster/Documents/cash-n/cashn-wallet/node_modules/broccoli/dist/builder.js:100:19)
at /Users/freakyspeedster/Documents/cash-n/cashn-wallet/node_modules/ember-cli/lib/models/builder.js:220:32
at tryCatcher (/Users/freakyspeedster/Documents/cash-n/cashn-wallet/node_modules/ember-cli/node_modules/rsvp/dist/rsvp.js:326:21)
at invokeCallback (/Users/freakyspeedster/Documents/cash-n/cashn-wallet/node_modules/ember-cli/node_modules/rsvp/dist/rsvp.js:498:33)
at publish (/Users/freakyspeedster/Documents/cash-n/cashn-wallet/node_modules/ember-cli/node_modules/rsvp/dist/rsvp.js:484:9)
at flush (/Users/freakyspeedster/Documents/cash-n/cashn-wallet/node_modules/ember-cli/node_modules/rsvp/dist/rsvp.js:2441:7)
at processTicksAndRejections (internal/process/task_queues.js:75:11)
at runNextTicks (internal/process/task_queues.js:62:3)
at processTimers (internal/timers.js:472:9)
这看起来是issue in ember-cli。不必保持ember-cli和ember-source版本同步，因此现在您应该可以运行
npm install --save-dev [email protected]
返回到可以解决您问题的版本。