Deploy DacPac with DSC suceeded only the first time

I've this simple configuration, when I run the Dsc-StartConfiguration the first time everything goes well, the database gets deployed and all the tables are there.

    xDatabase DeployDac
    {
        Ensure = "Present"
        SqlServer = "."
        SqlServerVersion = "2012"
        DatabaseName = "TailspinToys"
        Credentials = (New-Object System.Management.Automation.PSCredential("sa", (ConvertTo-SecureString "xxxx" -AsPlainText -Force)))
        DacPacPath =  $sourceFiles + "Tailspin.Schema.DacPac"
        DacPacApplicationName = "Tailspin"
    }

But, as you can see from this log, running a subsequent time it gives errors.

VERBOSE: [WEBTEST2]: LCM:  [ Start  Resource ]  [[xDatabase]DeployDac]
VERBOSE: [WEBTEST2]: LCM:  [ Start  Test     ]  [[xDatabase]DeployDac]
VERBOSE: [WEBTEST2]: LCM:  [ End    Test     ]  [[xDatabase]DeployDac]  in 0.0000 seconds.
VERBOSE: [WEBTEST2]: LCM:  [ Start  Set      ]  [[xDatabase]DeployDac]
VERBOSE: [WEBTEST2]:                            [[xDatabase]DeployDac]Dac Deploy Failed
VERBOSE: [WEBTEST2]: LCM:  [ End    Set      ]  [[xDatabase]DeployDac]  in 1.1560 seconds.
VERBOSE: [WEBTEST2]: LCM:  [ End    Resource ]  [[xDatabase]DeployDac]

If I remove a table to verify if the dacpac correctly restore it, nothing happens. Also even if I use -Verbose I'm not able to understand what goes wrong with dacpac, because DSC resource is only telling me that "Dac Deploy FAiled".

I wish

1) The resource should return  real error if the dacpac does not gets deployed
2) I wish to know the output of the dacpac to troubleshoot the error

Gian Maria.

Ricci Gian Maria. (http://www.codewrecks.com)