javascript - Phantom.js Webdriver.io Error: SyntaxError: DOM Exception 12 -

we doing testing webdriver.io, , phantom.js. following works fine, gives me list of elements:

return client     .url(config.host)     .waitforvisible('#myvenuelist', 2000)     .click('#myvenuelist')     .elements('li.venue')     .then(function(venues)     {         // make sure there @ least 1 device         // scan in before , check size         venues.value.length.should.be.at.least(venuelist.length);         done();     }); 

but go on next test, same thing:

return client     .url(config.host)     .waitforvisible('#myvenuelist', 2000)     .click('#myvenuelist')     .waitforvisible("li.venue[data-id=" + allvenues[0].venue_id + "]", 5000)     .click("li.venue[data-id=" + allvenues[0].venue_id + "] a[class='btn primary']")     .waitforvisible('a[class="tab beacons"]', 2000)     .click('a[class="tab beacons"]')     .waitforvisible('a[class="tab beacons active"]', 2000)     .elements("a[class='add-monitor btn primary']")     .then(function(devicelist)     {         devicelist.value.length.should.be.at.least(1);         done();     }); 

i devicelist object. if inspect it, value member array, expected. second try access array, if assigning variable, following error:

commanderror: promise fulfilled got rejected following reason: error: syntaxerror: dom exception 12  

this driving me crazy. there reports of dom exception 12 error around, don't seem apply i'm doing, , many of them refer old versions of phantom.js. on 1.9.8.

try this:

let venueid = allvenues[0].venue_id;  return client     .url(config.host)     .waitforvisible('#myvenuelist', 2000)     .click('#myvenuelist')     .waitforvisible(`li.venue[data-id={venueid}]`, 5000)     .click(`li.venue[data-id={venueid}] a.btn.primary`)     .waitforvisible('a.tab.beacons', 2000)     .click('a.tab.beacons')     .waitforvisible('a.tab.beacons.active', 2000)     .elements("a.add-monitor.btn.primary")     .then( devicelist => devicelist.value.length.should.be.at.least(1) );