Error in table(testlabel, t.pred$predictions) : all arguments must have the same length

[seuriously]

Hi,
I tried to run rf_opt where my train has dim=101673, 10 whilst my test dim=43574, 10.
I face this error:
Error in table(testlabel, t.pred$predictions) :
all arguments must have the same length
Timing stopped at: 4.31 0.22 1.81

I've checked there's no NA values on both dataset.
All my variables are factor.

When i run iris_train and iris_test it run smoothly. when i use iris_train as is and sampled the iris_test to 30 it still work.
when I sample my train and test both to 1000 rf_opt run smoothly.

So I'm kind of confussed here. If it because of different number of rows why on iris dataset with different number of rows it still work.

thx.