On this page, you will find more information about the most common causes and most relevant solutions for the Dota 2 error 'store error'. Do you need help straight away? Visit our support page.
The Valve Corporation documentation indicates that error code 'store error' is caused by the following problem: "It prevents players from searching through the in-game or the community store.".
Do you think there is another cause for this error? Let others know in the comments.