r - How to choose the "family" on gbm.step?

Question

my dependent variable is continuous and not normal but I'm not sure which family to choose ... when I run the analysis, this message appears:

restart model with a smaller learning rate or smaller step size ... it is the first time that I do this analysis and any help would be very welcome. thanks

ina <- gbm.step(data=bonaci, gbm.x = 10:33, gbm.y = 9, 
                family = "gaussian", tree.complexity = 5, 
                learning.rate = 0.01, bag.fraction = 0.5)

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