line search fails: “kernlab class prediction calculations failed; returning NAs”

[savagyan00]

Hi,

Thank you for the tool! I am trying to train it on a reference dataset with 6 categories. I am passing a ranked expression matrix, and getting these warnings:

line search fails -2.997281 0.4479518 1.386412e-05 4.884435e-06 -2.140079e-08 7.262897e-09 -2.612279e-13 Warning message in method$predict(modelFit = modelFit, newdata = newdata, submodels = param): “kernlab class prediction calculations failed; returning NAs”

This is the code snippet for training (with all defaults):
reference <- trainModel(reference)

What can be the reason? Do I need to tweak any of the arguments to the trainModel function to avoid this behaviour?

Thanks in advance for your help!