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VHDL attribute error at <location>: name <name> was used but not declared as an object

CAUSE: At the specified location in a VHDL Design File (.vhd), you used the specified name for an item (for example, an attribute). However, the name was not declared as an object, that is, as a signal, variable, or constant. You must declare the name as an object before you can use it for the item.
ACTION: Replace the name with a name that is declared as an object. Or, declare the name as an object.

See also:

Sections 4.4 and 5.1, and 6.6 of the IEEE Std 1076-1993 IEEE Standard VHDL Language Reference Manual

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