SQL CE error: Can't find pinvoke dll 'sqlceme35.dll'

I'm developing a Windows CE application on a PicoMOD3 hardware with NKP3_CORE_CF35_090624.bin kerner.
In a Visual Studio 2008 project (language: VB) I added an SQL CE data source and placed a DataGrid bound to it.
When I launch debug on the device, I get this error: "SQL CE error: Can't find pinvoke dll 'sqlceme35.dll'".
I've tried to install sqlce.wce5.armv4i.CAB, sqlce.repl.wce5.armv4i.CAB and sqlce.dev.IT.wce5.armv4i.CAB found in C:\Program Files\Microsoft SQL Server Compact Edition\v3.5\Devices\wce500\armv4i but nothing has changed.
How can I solve the problem? Thanks.

Problem solved! Thank you.