If you see the following error, then check to see if all of your sections are hidden. SellerDeck requires at least one section to be active in order to be able to upload:
Operation: Opening the [Product] table where [Catalog reference] = 'A000' AND ([bSuppressHtml] Is NULL OR [bSuppressHtml] = false) AND (NOT [Status] = 'D') AND ([nParentSectionID] IN ()) sorted by [Price]
Syntax error (missing operator) in query expression '`Catalog reference` = 'A000' AND (`bSuppressHtml` Is NULL OR `bSuppressHtml` = false) AND (NOT `Status` = 'D') AND (`nParentSectionID` IN ())'.
Operation: Opening the [Product] table where [Catalog reference] = 'A000' AND ([bSuppressHtml] Is NULL OR [bSuppressHtml] = false) AND (NOT [Status] = 'D') AND ([nParentSectionID] IN ()) sorted by [Price]
Syntax error (missing operator) in query expression '`Catalog reference` = 'A000' AND (`bSuppressHtml` Is NULL OR `bSuppressHtml` = false) AND (NOT `Status` = 'D') AND (`nParentSectionID` IN ())'.