Android add library via eclipse grayed out -

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i'm trying add library reference project , when go project > properties > android window , click add, library project grayed out (see below). idea why happening? android sdk being referenced in preferences , build target (version 7) selected.

thanks

enter image description here

add/import project want reference library eclipse , make sure have open. library's api level may not higher project.

if project selected reference, have remove first.

i'm not sure if jdk version relevant, recall having problems referenced libraries under version 1.6.


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