Reproduction:
local TweenService = game:GetService("TweenService")
TweenService:Create(Instance.new("IntValue"), TweenInfo.new(), {Value = "string"})
Result:
TweenService:Create property named 'Value' does not match toValue (property is a 'int', toValue is a 'string')
toValue does not have any meaning to the user. This text should be removed, and the error should properly guide the user to the property table.
Example:
TweenService:Create: bad type of 'Value' in property table ('int' expected, got 'string')
Aside: Errors generated by TweenService.Create are prefixed with TweenService:Create, with no character separating Create from the rest of the message, which can be somewhat confusing.