Runtime error when building model from appended data SAS Miner

[jonesj22]

In Miner, I have three different training data sets (all with the same features) that I am taking specific samples from for undersampling/oversampling purposes. Once I have ran the sample nodes, I append the three different data sets together with the append node to create a new training data set. Similarly, I use the append node on two different validation data sets to create a single new validation set. I would like to run a decision tree model using the new training and validation data sets. However, when I try running the decision tree node, I get a run time error. I am also getting a runtime error when trying to run a stat explore node. I have checked to see if my two datasets are free of issues, and they are. For the decision tree node, I am getting system error -S-, and for the stat explore node I am getting system error 3000. Am I using the append node improperly? Below is an image of my process flow.

[WendyCzika]

Your diagram looks fine to me assuming you have all of your data roles set correctly... If you open the SAS log from the results of either of the failing nodes (open the node's Results, go to View>SAS Results>Log), do you see any more informative error messages?