[Server thread/WARN] [FML]: Attempted to add a EntityItem to the world with a invalid item at

Hi, so basically I'm running a modded 1.7.10 server and it only has a backpack mod and orespawn. When we spawn mobzilla the whole server crashes and the console spamming:

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[20:26:01] [Server thread/WARN] [FML]: Attempted to add a EntityItem to the world with a invalid item at (223.73, 95.52, -163.95), this is most likely a config issue between you and the server. Please double check your configs

[20:26:01] [Server thread/WARN] [FML]: Attempted to add a EntityItem to the world with a invalid item at (227.73, 102.52, -152.95), this is most likely a config issue between you and the server. Please double check your configs

[20:26:01] [Server thread/WARN] [FML]: Attempted to add a EntityItem to the world with a invalid item at (221.73, 95.52, -152.95), this is most likely a config issue between you and the server. Please double check your configs

[20:26:01] [Server thread/WARN] [FML]: Attempted to add a EntityItem to the world with a invalid item at (226.73, 102.52, -157.95), this is most likely a config issue between you and the server. Please double check your configs

[20:26:01] [Server thread/WARN] [FML]: Attempted to add a EntityItem to the world with a invalid item at (235.73, 98.52, -161.95), this is most likely a config issue between you and the server. Please double check your configs

[20:26:01] [Server thread/WARN] [FML]: Attempted to add a EntityItem to the world with a invalid item at (225.73, 102.52, -156.95), this is most likely a config issue between you and the server. Please double check your configs

[20:26:01] [Server thread/WARN] [FML]: Attempted to add a EntityItem to the world with a invalid item at (231.73, 102.52, -160.95), this is most likely a config issue between you and the server. Please double check your configs

[20:26:01] [Server thread/WARN] [FML]: Attempted to add a EntityItem to the world with a invalid item at (225.73, 96.52, -159.95), this is most likely a config issue between you and the server. Please double check your configs

[Pterodactyl Daemon] Your server is sending too much data too quickly! Automatic spam detection triggered.

[20:26:02] [Server thread/WARN] [FML]: Attempted to add a EntityItem to the world with a invalid item at (224.73, 91.57, -158.01), this is most likely a config issue between you and the server. Please double check your configs

[20:26:02] [Server thread/WARN] [FML]: Attempted to add a EntityItem to the world with a invalid item at (226.73, 91.57, -153.01), this is most likely a config issue between you and the server. Please double check your configs

[20:26:02] [Server thread/WARN] [FML]: Attempted to add a EntityItem to the world with a invalid item at (224.73, 92.57, -158.01), this is most likely a config issue between you and the server. Please double check your configs

[20:26:02] [Server thread/WARN] [FML]: Attempted to add a EntityItem to the world with a invalid item at (224.73, 93.57, -156.01), this is most likely a config issue between you and the server. Please double check your configs

[20:26:02] [Server thread/WARN] [FML]: Attempted to add a EntityItem to the world with a invalid item at (224.73, 90.57, -158.01), this is most likely a config issue between you and the server. Please double check your configs

is there any way I can fix this?