Compile errors in Release mode while there are no errors in Debug mode

[C# Programming]

Hi,

Compilation in Release mode failed, where as it is successful in Debug mode.
few errors are listed below.

1. Error: The type or namespace name 'AxOfficeCtrl' could not be found (are you missing a using directive or an assembly reference?
2. Error: The type or namespace name 'Practices' does not exist in the namespace 'Microsoft' (are you missing an assembly reference?)

Thanks in advance.