MdTooltip broke the app after beta.11

Bug, feature request, or proposal:

Bug: MdTooltip broke my app after upgrade to beta.11

What is the expected behavior?

Before beta.11 the usage of MdTooltip was working as expected.

What is the current behavior?

Do not display my cards and broke the app.

What are the steps to reproduce?

Just create a simple button with a tooltip like this:

<button md-button md-tooltip="just a test" >
  <md-icon>play_arrow</md-icon>
</button>

What is the use-case or motivation for changing an existing behavior?

Avoid this error.

Which versions of Angular, Material, OS, browsers are affected?

angular-cli: 1.0.0-beta.22-1 @angular: 2.2.3 @angular/material: 2.0.0-alpha.11-3 node: 6.5.0 os: darwin x64

Is there anything else we should know?

Here it goes a print screen of the error on Chrome console.

I have no idea what this error means, but if I remove the tooltip from the button everything works as expected.

Thank you.

[paulogr]

Thank you @dahaupt and @crisbeto for your help.

After some debugging and testing the md-tooltip in other sections of my app finally I got an error message that shows me I miss to include the hammerJS on my app.

Just included HammerJS on my app and don’t get this error anymore.

That said, now my question is…

Is this mandatory to use hammerJS now? Before beta.11 I never needed to include HammerJS and the docs said to include only if you are using md-slide-toggle or md-slider https://github.com/angular/material2/blob/master/GETTING_STARTED.md#additional-setup-for-md-slide-toggle-and-md-slider

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