无法在本地启动heroku

是否有人知道当我尝试在本地启动heroku时（我在本地编写Heroku后出现此错误）时出现此错误：

[WARN] No ENV file found 15:23:12 worker.1 | C:\Users\Marija\Documents\Projects\project\node_modules\natural\lib\natural\brill_pos_tagger\lib \Brill_POS_Tagger.js:26 15:23:12 worker.1 | logger.setLevel('WARN'); 15:23:12 worker.1 | ^ 15:23:12 worker.1 | TypeError: logger.setLevel is not a function 15:23:12 worker.1 | at Object.<anonymous> (C:\Users\Marija\Documents\Projects\project\node_modules\natural\lib \natural\brill_pos_tagger\lib\Brill_POS_Tagger.js:26:8) 15:23:12 worker.1 | at Module._compile (module.js:570:32) 15:23:12 worker.1 | at Object.Module._extensions..js (module.js:579:10) 15:23:12 worker.1 | at Module.load (module.js:487:32) 15:23:12 worker.1 | at tryModuleLoad (module.js:446:12) 15:23:12 worker.1 | at Function.Module._load (module.js:438:3) 15:23:12 worker.1 | at Module.require (module.js:497:17) 15:23:12 worker.1 | at require (internal/module.js:20:19) 15:23:12 worker.1 | at Object.<anonymous> (C:\Users\Marija\Documents\Projects\project\node_modules\natural\lib \natural\index.js:81:26) 15:23:12 worker.1 | at Module._compile (module.js:570:32) [DONE] Killing all processes with signal null internal/util.js:183 throw new errors.Error('ERR_UNKNOWN_SIGNAL', signal); ^ Error [ERR_UNKNOWN_SIGNAL]: Unknown signal: null at convertToValidSignal (internal/util.js:183:9) at ChildProcess.kill (internal/child_process.js:381:5) at EventEmitter.<anonymous> (C:\Users\Marija\AppData\Local\heroku\client\node_modules\foreman\lib\proc.js:54:11) at emitOne (events.js:120:20) at EventEmitter.emit (events.js:210:7) at ChildProcess.<anonymous> (C:\Users\Marija\AppData\Local\heroku\client\node_modules\foreman\lib\proc.js:50:13) at emitTwo (events.js:125:13) at ChildProcess.emit (events.js:213:7) at Process.ChildProcess._handle.onexit (internal/child_process.js:200:12)