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Hi Ori,
Sorry to hear this.
The table importer supports data in csv format, but only accepts one table at a time as it would not be able to differentiate between multiple tables in one xslx file.
My suggestion would be to save each as individual csv files, and load one at a time so that you can ensure each table is of the correct format and types.
I would highly recommend the Introduction to Developer course on KX Academy (if you have not already seen it) for step-by-step guidance through the table importer functionality.
Let us know how you get on, and if you have any more questions.
Laura