When I try to run tests with wdio I am getting `ERROR: Unable to create new service: ChromeDriverService` It also says `Driver info: driver.version: unknown`

In my wdio.conf.js file, I have 

```
seleniumArgs: {
        version: '3.141.0',
        drivers: {
            chrome: {
                version: '2.43'
            },
            firefox: {
                version: '0.23.0'
            }
        }
    },
    seleniumInstallArgs: {
        version: '3.141.0',
        drivers: {
            chrome: {
                version: '2.43'
            },
            firefox: {
                version: '0.23.0'
            }
        }
    },

```

Any idea what I am doing wrong here, or what other information I could provide? The full error is:

```
ERROR: Unable to create new service: ChromeDriverService
Build info: version: '3.141.0', revision: '2ecb7d9a', time: '2018-10-31T20:22:52'
System info: host: '<me>', ip: '<my_ip>', os.name: 'Mac OS X', os.arch: 'x86_64', os.version: '10.14.6', java.version: '1.8.0_212'
Driver info: driver.version: unknown

```