No attributes! message in Wrapper

Hi,

I'm using AMT from Colab (Wrapper). I can install and initialize the appropriate packages. Also, I can read the data from an arff file. See below the result (from dat_train):

@relation veh0

@attribute latitude {41.38706007,41.38712686,41.38719208,41.38726088,41.38732943,41.38739179,41.38745434,41.38751989,41.38758707,41.38765102,41.38771408,41.3877823,41.3878506,41.38791744,41.38798466,41.38804581,41.38810646,41.38816678,41.38823401,41.3882989,41.38836482,41.38843183,41.38849516,41.38855998,41.38862355,41.38868963,41.38875359,41.38881859,41.38888044,41.38894493,41.38900953,41.38907826,41.38913801,41.3892002,41.38926563,41.38932593,41.38938605,41.3894518,41.38951356,41.38957936,41.3896482,41.38971439,41.38978428,41.38984456,41.3899095,41.38997145,41.39003503,41.3901042,41.39016754,41.39023644,41.39029781,41.39035998,41.39042374,41.39049258,41.39055918,41.39062074,41.39068748,41.39074902,41.39081614,41.39087913,41.39094288,41.39100637,41.39107512,41.39114211,41.39118959,41.39125493,41.39132377,41.39138518,41.39140328,41.39144699,41.39144919,41.39149959,41.39150773,41.39154775,41.39154844,41.39161105,41.39161706,41.39168293,41.39168546,41.3917516,41.39175491,41.39182214,41.39182284,41.39188578,41.39189108,41.39191639,41.39193911,41.39194108,41.39194639,41.3919493,41.39195945,41.39196328,41.39198902,41.39202835,41.3920514,41.39208835,41.39210703,41.39213127}
@attribute longitude {2.157958051,2.158046419,2.158132701,2.158223733,2.15831443,2.158396929,2.158479725,2.158566488,2.158655405,2.158740005,2.158823436,2.15891369,2.159004051,2.159092479,2.159181421,2.159262319,2.159342568,2.159422372,2.159511326,2.159597204,2.159684472,2.159773137,2.159856861,2.159942632,2.16002674,2.160114176,2.160198835,2.160284894,2.160366739,2.160452068,2.160537532,2.160628458,2.160709121,2.160794999,2.160885346,2.160968616,2.16105165,2.161142443,2.161225852,2.161306362,2.161390584,2.161471561,2.161562705,2.161642439,2.161728329,2.161810262,2.161894426,2.161986009,2.162069834,2.16216101,2.162242223,2.16232449,2.162408869,2.16249996,2.162588096,2.162669555,2.16275788,2.162839308,2.16292813,2.163011479,2.163095809,2.163179233,2.163269571,2.163359574,2.163477506,2.163564721,2.163656606,2.163737737,2.163819238,2.163899322,2.164006914,2.164097393,2.164187594,2.164279184,2.164368761,2.164451764,2.164546114,2.164585699,2.164602948,2.164602949,2.164630123,2.164632724,2.164643589,2.164696115,2.164778434,2.164855507,2.164945108,2.165032475,2.165108555,2.165185004,2.165269831,2.165351781,2.165439141,2.165524191,2.165613039,2.165691277,2.165803079,2.165917674,2.166026695}

@data
41.39140328,2.166026695
41.39144919,2.165917674
41.39149959,2.165803079
41.39154775,2.165691277
41.39161105,2.165613039
41.39168293,2.165524191
41.3917516,2.165439141
41.39182214,2.165351781
41.39189108,2.165269831
41.39196328,2.165185004

However, when executing the line forecaster.build_forecaster(dat_train), I get this error:

JavaException: weka.filters.unsupervised.attribute.AddID: No attributes!

My code is: 

forecaster = WekaForecaster()
forecaster2 = WekaForecaster()
cls = Classifier(classname="weka.classifiers.trees.AlternatingModelTree")
cls.jwrapper.setShrinkage(j)
cls.jwrapper.setNumberOfIterations(h)
forecaster.base_forecaster = cls
cls2 = Classifier(classname="weka.classifiers.trees.AlternatingModelTree")
cls2.jwrapper.setShrinkage(j)
cls2.jwrapper.setNumberOfIterations(h)
forecaster2.base_forecaster = cls2
forecaster.fields_to_forecast = "latitude"  # lat
forecaster2.fields_to_forecast = "longitude"
forecaster.build_forecaster(dat_train)
forecaster2.build_forecaster(dat_train)
forecaster.prime_forecaster(dat_train)
forecaster2.prime_forecaster(dat_train)

It's weird because dat_train has the defined attributes. Any clue? Thanks
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