Failed to activate the element-helper package

[Enter steps to reproduce:]

1. ...
2. ...

**Atom**: 1.45.0 x64
**Electron**: 4.2.7
**OS**: Unknown Windows version
**Thrown From**: [element-helper](https://github.com/ElemeFE/element-helper) package 0.5.4

### Stack Trace

Failed to activate the element-helper package

```
At Arguments to CompositeDisposable.add must have a .dispose() method

TypeError: Arguments to CompositeDisposable.add must have a .dispose() method
at assertDisposable (~/AppData/Local/atom/app-1.45.0/resources/app/static/:11:1217666)
at CompositeDisposable.add (~/AppData/Local/atom/app-1.45.0/resources/app/static/:11:1218634)
at Object.consumeProvider (~/AppData/Local/atom/app-1.45.0/resources/app/static/:11:162456)
at Object.consumeProvider_2 (~/AppData/Local/atom/app-1.45.0/resources/app/static/:11:162154)
at Provider.provide (~/AppData/Local/atom/app-1.45.0/resources/app/static/:14:1122140)
at ServiceHub.provide (~/AppData/Local/atom/app-1.45.0/resources/app/static/:11:3321702)
at Package.activateServices (~/AppData/Local/atom/app-1.45.0/resources/app/static/:11:3329988)
at Package.activateNow (~/AppData/Local/atom/app-1.45.0/resources/app/static/:11:3326964)
at measure (~/AppData/Local/atom/app-1.45.0/resources/app/static/:11:3326288)
at Package.measure (~/AppData/Local/atom/app-1.45.0/resources/app/static/:11:3323898)
at activationPromise.activationPromise.Promise (~/AppData/Local/atom/app-1.45.0/resources/app/static/:11:3326148)
at new Promise ()
at Package.activate (~/AppData/Local/atom/app-1.45.0/resources/app/static/:11:3326091)
at PackageManager.activatePackage (~/AppData/Local/atom/app-1.45.0/resources/app/static/:11:382452)
at o.forEach.e (~/AppData/Local/atom/app-1.45.0/resources/app/static/:11:377618)
at Array.forEach ()
at disabledPackagesSubscription.disabledPackagesSubscription.config.onDidChange (~/AppData/Local/atom/app-1.45.0/resources/app/static/:11:377602)
at emitter.on (~/AppData/Local/atom/app-1.45.0/resources/app/static/:11:334653)
at Function.simpleDispatch (~/AppData/Local/atom/app-1.45.0/resources/app/static/:11:1214120)
at Emitter.emit (~/AppData/Local/atom/app-1.45.0/resources/app/static/:11:1215561)
at Config.emitChangeEvent (~/AppData/Local/atom/app-1.45.0/resources/app/static/:11:337141)
at Config.setRawValue (~/AppData/Local/atom/app-1.45.0/resources/app/static/:11:334381)
at Config.set (~/AppData/Local/atom/app-1.45.0/resources/app/static/:11:330175)
at Config.removeAtKeyPath (~/AppData/Local/atom/app-1.45.0/resources/app/static/:11:332198)
at Package.enable (~/AppData/Local/atom/app-1.45.0/resources/app/static/:11:3323683)
at PackageManager.enablePackage (~/AppData/Local/atom/app-1.45.0/resources/app/static/:11:375316)
at HTMLButtonElement.enablementButtonClickHandler (~/AppData/Local/atom/app-1.45.0/resources/app/static/:14:2641697)
```

### Commands

```
-1:10.8.0 core:confirm (input.hidden-input)
```

### Non-Core Packages

```
atom-html-preview 0.2.6
element-helper 0.5.4
emmet 2.4.3
enable-packages 1.4.2
packages-txt 0.2.2
teletype 0.13.4
```