Error message RE Shop Menu

[Boubou-1741]

Hi:

Have you tried the steps provided here:

Can't access wardrobe

FYI had this same exact problem and error message this evening after earning the Legionnaire Achievement after purchase of the legion DD item pack…the helm transmog also did not appear in mystic I logged completely out of D3 and the launcher, relaunched and logged back in and problem was gone.