Error while running a programmable filter more than once in the same session


I am having the next error message while trying to run a programmable filter more than one time in a session. What I find estrange is that if I run my programmable filter only once it works fine but when I step to the next file it gives the error (I am on paraview 5.10 on Linux):

Traceback (most recent call last):
File “”, line 22, in
File “”, line 20, in RequestData
File “/home/softs/softs/ParaView-5.10.1-MPI-Linux-Python3.9-x86_64/bin/…/lib/python3.9/encodings/”, line 26, in decode
return codecs.ascii_decode(input, self.errors)[0]
UnicodeDecodeError: ‘ascii’ codec can’t decode byte 0xc2 in position 23007: ordinal not in range(128)

Thanks very much