ADO reference missing after Build - Clean

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ADO

Basic

I am developing an application in Visual Basic 2010 that is accessing a database using ADO

The problem I have is that the reference to ADO seems to disappear when I clean the build.

The error message I get is:
'ADODB' is not declared. It may be inaccessible due to its protection level.

I have checked the application references 100 times and
Microsoft Active X Data Objects 6.1 Library
is present.

The application runs perfect in the environment

Please assist before I go crazy

BR