Fd

[abdellahmehdi 0]

[Markus Kinzler 174]

Have you checked the possible reason stated in that message?

[Serge_G 87]

This is an error I had sometimes when using an FDQuery on a Form and the related FDConnection in a DataModule. 

I do not hide from you that this has the gift of annoying me, especially when I use the visual designer of LiveBindings and my DataModule is in the list of uses

[Stano 143]

My experience is to have it in the interface section.