Error with licenses.licx - 'Unable to resolve...'

Hi,

I'm having an error with the licenses.licx file. I have included it and added
RedGate.SQLCompare.Engine.Database,
RedGate.SQLCompare.Engine

RedGate.SQLDataCompare.Engine.ComparisonSession,
RedGate.SQLDataCompare.Engine

as stated in the help file. I have also added references to the following dlls

RedGate.SQL.Shared.dll
RedGate.SQLCompare.Engine.dll
RedGate.SQLDataCompare.Engine.dll

However, when I try to compile, I get the errors

Unable to resolve type 'RedGate.SQLCompare.Engine.Database, '
Unable to resolve type 'RedGate.SQLCompare.Engine'
Unable to resolve type 'RedGate.SQLDataCompare.Engine.ComparisonSession, '
Unable to resolve type 'RedGate.SQLDataCompare.Engine'

Any ideas? Thanks in advance