File saving error

here it is:

SerializationException: End of Stream encountered before parsing was completed.
System.Runtime.Serialization.Formatters.Binary.__BinaryParser.Run () (at <7d97106330684add86d080ecf65bfe69>:0)
System.Runtime.Serialization.Formatters.Binary.ObjectReader.Deserialize (System.Runtime.Remoting.Messaging.HeaderHandler handler, System.Runtime.Serialization.Formatters.Binary.__BinaryParser serParser, System.Boolean fCheck, System.Boolean isCrossAppDomain, System.Runtime.Remoting.Messaging.IMethodCallMessage methodCallMessage) (at <7d97106330684add86d080ecf65bfe69>:0)
System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize (System.IO.Stream serializationStream, System.Runtime.Remoting.Messaging.HeaderHandler handler, System.Boolean fCheck, System.Boolean isCrossAppDomain, System.Runtime.Remoting.Messaging.IMethodCallMessage methodCallMessage) (at <7d97106330684add86d080ecf65bfe69>:0)
System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize (System.IO.Stream serializationStream, System.Runtime.Remoting.Messaging.HeaderHandler handler, System.Boolean fCheck, System.Runtime.Remoting.Messaging.IMethodCallMessage methodCallMessage) (at <7d97106330684add86d080ecf65bfe69>:0)
System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize (System.IO.Stream serializationStream, System.Runtime.Remoting.Messaging.HeaderHandler handler, System.Boolean fCheck) (at <7d97106330684add86d080ecf65bfe69>:0)
System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize (System.IO.Stream serializationStream, System.Runtime.Remoting.Messaging.HeaderHandler handler) (at <7d97106330684add86d080ecf65bfe69>:0)
System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize (System.IO.Stream serializationStream) (at <7d97106330684add86d080ecf65bfe69>:0)
SaveSystem.LoadPlayer () (at Assets/Scripts/SaveSystem.cs:28)
CircleStuff.Die () (at Assets/Scripts/CircleStuff.cs:54)
CircleStuff.OnBecameInvisible () (at Assets/Scripts/CircleStuff.cs:35)

Any help would be appreciated.

stream.Position = 0;