Project with Aggregate activity can't build executable due to type mismatch

[magallardo]

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[] enhancement request
[] feature request
[] support request
[] general question

Current behavior (how does the issue manifest):
After uploading the aggregate activity into Flogo Enterprise and configuring the activity, building the executable generates the following error:

Failed to build App TestStream: Failed to push application. Error: 'Internal Server Error', Detail: Build flogo engine error, Build app error build error [exit status 2], details # github.com/TIBCOSoftware/flogo-contrib/activity/aggregate src/github.com/TIBCOSoftware/flogo-contrib/activity/aggregate/activity.go:155:63: cannot use moveWindow (type func("github.com/TIBCOSoftware/flogo-lib/core/activity".Context) bool) as type support.TimerCallback in argument to timerSupport.CreateTimer src/github.com/TIBCOSoftware/flogo-contrib/activity/aggregate/activity.go:160:63: cannot use moveWindow (type func("github.com/TIBCOSoftware/flogo-lib/core/activity".Context) bool) as type support.TimerCallback in argument to timerSupport.CreateTimer

Expected behavior:

Build an executable without errors.

Minimal steps to reproduce the problem (not required if feature enhancement):

Just create a simple application in Flogo enterprise after uploading the activity and then build an executable.

What is the motivation / use case for changing the behavior?

It is a bug.

Please tell us about your environment (Operating system, docker version, browser & verison if webui, etc):

Mac OS.

Flogo version (CLI & contrib/lib. If unknown, leave empty or state unknown): 0.X.X

Flogo Enterprise 8.2

Additional information you deem important (e.g. issue happens only occasionally):