Webdriver-manager error: Unable to create session with *my config* - selenium

Question

I run into the following problem after updating webdriver-manager:
E/launcher - SessionNotCreatedError: Unable to create session from
my config is printed here
webdriver-manager Version: 12.1.5
Node Version: 10.15.3
Protractor Version: 5.4.2
Browser(s): Chrome
Operating System and Version: Win 7 / Ubuntu
This is my config file which worked for the last 1.5 years:
exports.config = {
"seleniumAddress": "http://localhost:4444/wd/hub",
"seleniumPort": "4444",
"capabilities": {
"browserName": "chrome",
"unexpectedAlertBehaviour": "accept",
"perform": "ANY",
"version": "ANY",
"chromeOptions": {
"perfLoggingPrefs": {
"traceCategories": "blink.console,devtools.timeline,disabled-by-default-devtools.timeline,toplevel,disabled-by-default-devtools.timeline.frame,benchmark"
},
"prefs": {
"credentials_enable_service": false
},
"args": ["--headless", "--window-size=800,1080", "--disable-blink-features=BlockCredentialedSubresources", "--no-sandbox", "--test-type=browser", "--disable-dev-shm-usage", "--enable-gpu-benchmarking", "--enable-thread-composting" , "--start-maximized"]
},
"loggingPrefs": { "performance": "ALL" }
},
"jasmineNodeOpts": {
"showColors": true,
"defaultTimeoutInterval": 9999999
},
"allScriptsTimeout": 200000,
"params": {
"perf": {
"selenium": { "protocol": "http:", "slashes": true, "auth": null, "host": "localhost:4444", "port": 4444, "hostname": "localhost", "hash": null, "search": null, "query": null, "pathname": "/wd/hub", "path": "/wd/hub", "href": "http://localhost:4444/wd/hub" },
"browsers": [{
"browserName": "chrome",
"chromeOptions": {
"perfLoggingPrefs": {
"traceCategories": "blink.console,devtools.timeline,disabled-by-default-devtools.timeline,toplevel,disabled-by-default-devtools.timeline.frame,benchmark"
},
"args": ["--headless", "--disable-gpu", "--disable-blink-features=BlockCredentialedSubresources", "--no-sandbox", "--test-type=browser", "--disable-dev-shm-usage"]
},
"loggingPrefs": { "performance": "ALL" }
}],
"debugBrowser": false,
"actions": ["scroll"],
"metrics": ["TimelineMetrics", "ChromeTracingMetrics", "RafRenderingStats", "NetworkTimings", "NetworkResources"],
"metricOptions": {}
},
"warmup": false,
"agilar" : false
}
}
I know the file is a mess and it's more or less googled together, but it worked. Can you point me to what is causing this problem?

Answer 1

Is selenium server up and running at default address
"http://localhost:4444/wd/hub" . If it's not , start it by running : webdriver-manager start. Assuming you have webdriver-manager installed already.
Also I dont think you need to define seleniumPort when you have selenium address property given already in config. So remove this property "seleniumPort": "4444" from config.