error messages during running gamboost using caret

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I am running gamboost using Caret. The model was generated, but the running process gives the following error message as shown below. I am not clear what does that mean.

rd<- train(formula0, data = df.clean,method = "gamBoost",trControl = train_control,metric="RMSE")

The model looks like this

enter image description here

The error messages are

enter image description here

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