GIMP Version: 2.8.22
Operating System: Windows
GIMP Experience: Basic Level

List any relevant plug-ins or scripts:
FX-Foundry

List any ERROR messages you received:
Execution error for 'Drop Shadow':
Error: ( : 1) Procedure execution of gimp-selection-layer-alpha failed on invalid input arguments: Item 'Layer #1' (672) cannot be used because it has not been added to an image

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Hi, I'm trying to add a drop shadow using FX-Foundry - Layer Effects- Drop shadow, (it works on Filters-drop shadow)
i created a new white layer
then on a separate new layer i created a green square, i want to give the square a drop shadow on the white layer?
this is the error msg i get,
Execution error for 'Drop Shadow':
Error: ( : 1) Procedure execution of gimp-selection-layer-alpha failed on invalid input arguments: Item 'Layer #1' (672) cannot be used because it has not been added to an image
Does anybody know what this means n what I'm doing wrong?
Thanks