Good Afternoon, I just finished the 3rd week's secret chest challenge to get the Onslaught catalyst for my Choir of One. I opened the secret chest, and completed the boss encounter for Encore Coda. I also watched the video at the end. When I went to modify the Choir of One, it won't allow me to install Command Frame IV. Is this a glitch or is there something else needed for this command frame? I did the secret chests for weeks 1 and 2. Thanks, RAMS0008