I'm working on a project using ARIMA MODEL on stock price prediction.The problem is arriving when I'm applying the model for valid dataset.

Question

The problem is while splitting of dataset into train and valid data, I have performed the model prediction on Train data but when i'm using it for valid data its showing error as:

'only integers, slices (`:`), ellipsis (`...`), numpy.newaxis (`None`) and integer or boolean arrays are valid indices'  

This is the code which i'm applying for valid dataset:

AR_predict=results_AR.predict(start="2014-06-25", end="2014-09-25") AR_predict=AR_predict.cumsum().shift().fillna(0) AR_predict1=pd.Series(np.ones(valid.shape[0]) * np.log(valid['Count'])[0], index = valid.index) 
AR_predict1=AR_predict1.add(AR_predict,fill_value=0) 
AR_predict = np.exp(AR_predict1)

I'm getting error near first line. I would feel highly obliged if anyone can revert back to me