Galaxy S6 Edge 5.0 Rooted- "SIM Error" At Startup, Using AT&T Sim With Verizon Phone

Hello I need help. Every time I boot my phone it gives me this annoying notification about how my sim is not from verizon wireless. I have an at&t sim and I'm on andriod 5.0 rooted and I keep having to end the process of activation agent and force stop it for the message to go away. Help me please :confused::confused::confused:

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