ATL Provider Error ATL2033

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Failed to compile RGS. Value value specified in script not found in attribute block.

The RGS file references a value that is not in the attribute block.

The following sample files generate ATL2033. First the C++ file:

// ATL2033.cpp
// compile with: /c
// ATL2033 expected
#define _ATL_ATTRIBUTES
#include <atlbase.h>
#include <atlcom.h>

[ coclass, registration_script("ATL2033.rgs") ]
// to resolve, change the previous line to
// [ coclass, registration_script("ATL2033.rgs"), threading(both) ]
class CATL2033
{
};

Then the RGS file:

HKLM
{
 val ATL2033 = s '[!threading(threading)]'
}