Dear Teo,
The issue has been resolved. It was related to the CSV file containing training data for approximately 1100 points. No errors were detected within the SEPAL interface itself; the error was identified in the Google Earth Engine interface:
Error: A CSV row had more columns than the header in file 'TAreaCEarthGri_FeatureToPoin_ExportTable4TrainData.csv': row size 3 > header size 1 for a row starting with: "74", "599707;41", "44;1" (Error code: 3)
The problem was due to the use of incorrect delimiters. Instead of semicolons, I had used commas. After correcting this and rerunning the classification, everything worked fine:
Xcoordinate;YCoordinate;class 74.599707;41.44;1
I would also like to highlight another point. In previous classifications, when I manually marked the training data, I faced similar issues. I suspected that it might be due to insufficient computational resources for such a large area. After requesting and obtaining more resources, the classification of an area of about 1.6 million hectares was successful. At the time of classification, I had the following resources: Instance - $50.0/mo, Storage spending - $50.0/mo.
Therefore, the two key factors in resolving the issue were correcting the delimiters in the CSV file and increasing the computational resources.
Thank you for your response!