 However, the king and the bishops collaborated further as the Pope proved incapable to suppress these practices.Attempts to come to any form of agreement on the question of the investiture failed in 1106 at the Synod of Guastalla and 1107 in Châlons-en-Champagne.Henry's primary concern during his reign was the settlement of the Investiture Controversy, which had caused serious setbacks for the empire during the previous imperial tenure.