Cost of information error.

D:\REX\rat.venv\lib\site-packages\numpy\core\fromnumeric.py:3432: RuntimeWarning: Mean of empty slice. return _methods._mean(a, axis=axis, dtype=dtype, D:\REX\rat.venv\lib\site-packages\numpy\core_methods.py:190: RuntimeWarning: invalid value encountered in double_scalars ret = ret.dtype.type(ret / rcount) Traceback (most recent call last): File "d:\REX\rat\gui\widgets\UI_Main.py", line 159, in export self.eval() File "d:\REX\rat\gui\widgets\UI_Main.py", line 121, in eval self.results = self.isState.evaluate() File "d:\REX\rat\base\IsState.py", line 39, in evaluate results = Results(self.data) File "d:\REX\rat\base\results.py", line 29, in init self.evaluate() node.table(md) File "d:\REX\rat\base\decisionNode.py", line 230, in table self.overview(format) File "d:\REX\rat\base\decisionNode.py", line 253, in overview emv = self.emv_new() File "d:\REX\rat\base\decisionNode.py", line 94, in emv_new emv += branch.probability * branch.emv() File "d:\REX\rat\base\decisionBranch.py", line 74, in emv emv = -self.costOfInformation() File "d:\REX\rat\base\decisionBranch.py", line 108, in costOfInformation costOfInformation += method.costOfInformation AttributeError: 'Method' object has no attribute 'costOfInformation'