When I try to run test block receive this

[robin ivetic]

File "/home/otpisani/Downloads/top_block.py", line 139
    self.filter_fft_low_pass_filter_0 = filter.fft_filter_ccc(1, 
firdes.low_pass(1, 15.0, 10.0M, 2.5M, window.WIN_HAMMING, 0), 1)
                                                                                
             ^
SyntaxError: invalid decimal literal

>>> Done (return code 1)

What am'I doing wrong. using Python 3.10.8, and companion 3.10.4.0

Robin