量角器 - 错误：失败：WebDriverError

问：

我有一个量角器项目，它按照我的预期启动并运行规范，但将近 2 分钟后，它开始在其余测试用例上出现此错误。我不知道为什么。一周前它运行良好，但现在我遇到了这个错误，它没有提供（或我看不到）有关错误的任何细节。

"Error: Failed: WebDriverError
at stack (Z:\\dev\\lmw\node_modules\\protractor\node_modules\\jasmine-core\\lib\\jasmine-core\\jasmine.js:2200:17)
at buildExpectationResult (Z:\\dev\\lmw\node_modules\\protractor\node_modules\\jasmine-core\\lib\\jasmine-core\\jasmine.js:2170:14)
at Spec.expectationResultFactory (Z:\\dev\\lmw\node_modules\\protractor\node_modules\\jasmine-core\\lib\\jasmine-core\\jasmine.js:777:18)
at Spec.addExpectationResult (Z:\\dev\\lmw\node_modules\\protractor\node_modules\\jasmine-core\\lib\\jasmine-core\\jasmine.js:450:34)
at Env.fail (Z:\\dev\\lmw\node_modules\\protractor\node_modules\\jasmine-core\\lib\\jasmine-core\\jasmine.js:1192:25)
at Function.next.fail (Z:\\dev\\lmw\node_modules\\protractor\node_modules\\jasmine-core\\lib\\jasmine-core\\jasmine.js:4046:19)
at Z:\\dev\\lmw\node_modules\\protractor\node_modules\\jasminewd2\\index.js:64:48
at ControlFlow.emit (Z:\\dev\\lmw\node_modules\\protractor\node_modules\\selenium-webdriver\\lib\\events.js:62:21)
at ControlFlow.shutdown_ (Z:\\dev\\lmw\node_modules\\protractor\node_modules\\selenium-webdriver\\lib\\promise.js:2565:10)
at shutdownTask_.MicroTask (Z:\\dev\\lmw\node_modules\\protractor\node_modules\\selenium-webdriver\\lib\\promise.js:2490:53)"

关于项目的信息：它运行两个浏览器并使用 chromedriver_2.31.exe。

量角器.conf.js=>

directConnect: false, splitTestsBetweenCapabilties: true, multiCapabilities:[ { shardTestFiles: false, maxInstances: 1, maxSessions: 1, sequential: true, parallelCapability: true, browserName: 'chrome', specs: [ './tests/login/*.js', './tests/header/*.js', './tests/my-profile/*.js', './tests/nominee/*.js', './tests/left-menu/*.js', './tests/contact-us/*.js', './tests/relations/*.js', './tests/coordinator/*.js', './tests/sitemap/*.js', './tests/landing/*.js', './tests/vouchers/*.js', './tests/extend/*.js', './tests/activity/*.js' ] }, { shardTestFiles: false, maxInstances: 1, maxSessions: 1, sequential: true, parallelCapability: true, browserName: 'chrome', specs: [ './tests/enrollment/*.js', './tests/claim-/*.js', './tests/transfer/*.js', './tests/donate/*.js', './tests/buy/*.js', './tests/calculator/*.js' ] } ]

package.json =>{ "devDependencies": { "grunt-cli": "^1.2.0", "grunt-protractor-runner": "^4.0.0", "jasmine-spec-reporter": "^3.2.0", "protractor": "^5.0.0", "jasmine-reporters": "^2.0.0" } }