What was Charlemagnes failures?

Charlemagne's failures included difficulties in maintaining control over his vast empire, which led to fragmentation after his death in 814. He struggled with the integration of conquered peoples, facing resistance and rebellions, particularly in Spain and among the Saxons. Additionally, his reliance on local nobles for administration often resulted in challenges to central authority, undermining the cohesion of his realm. Lastly, Charlemagne's attempts to establish a unified Christian culture sometimes alienated those who adhered to different beliefs or practices.