PARIS (AP) — An investigation is blaming a design flaw for the inaccurate deployment of two satellites intended to bolster Europe’s answer to the GPS.

The results of the inquiry, released Wednesday by launch company Arianespace, said the error happened about 35 minutes into the Aug. 22 liftoff, when the satellites were sent into the wrong orbits. The inquiry found that a line of cold helium froze a crucial chemical compound in a nearby feed line.