Spreadsheet help

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I have made this spreadsheet but it only works sometimes.
Most days I open it I get this:

Sometimes it loads and I can see the prices & Qty.

what I use: =importxml(CONCATENATE(“https://api.evemarketer.com/ec/marketstat?usesystem=30002187",“&typeid=”&JOIN("&typeid=”,$B3:B10)), “//sell/min”)

Can anyone help me fix this problem please.

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bumpo

[Sasha_Winston]

https://i.imgur.com/chbeM59.png there must be no empty cells