Error: Promise was rejected with the following reason: selector needs to be typeof string

[ViaMay]

The problem

Autotests didn't work which last version WebdriverIO: 4.9.10

Environment

• WebdriverIO version: 4.9.10
• Node.js version: v6.9.2
• Standalone mode or wdio testrunner: wdio
• if wdio testrunner, running synchronous or asynchronous tests: synchronous
• Additional wdio packages used (if applicable):

Details

After update WebdriverIO I can have error about function isVisible or waitForExist where used it for my selector:

Link to Selenium/WebdriverIO logs

SongLine_Auto_tests-Webdriver_Run_Auto_test_1450.log

Code To Reproduce Issue [ Good To Have ]

Example error for test gallery image and movies add correct

Error: Promise was rejected with the following reason: selector needs to be typeof `string`     
at Page.Object.create.waitVisible.value (tests/Pages/UploadPage.js:18:52)     
at Context.<anonymous> (tests/tests/gallery.add.rename.delete.test.js:65:20)     
at new Promise (node_modules/wdio-sync/node_modules/core-js/library/modules/es6.promise.js:171:7)
at elements() - isExisting.js:46:17     
at isExisting() - waitForExist.js:67:22

UploadPage view:

Maybe it is duplicate #2481

[christian-bromann]

@ViaMay you need to use this.uploadFromComputerButtom.waitForExist() in there.
Join our for these kind of questions. This is not necessary an issue.

[ViaMay]

@christian-bromann still have this error

[ViaMay]

yesterday all work well. Now didn't

[ViaMay]

@christian-bromann set "webdriverio": "4.9.9" - all work well