AttributeError("'PyCall.jlwrap' object has no attribute 'encode'")

[TheBiotech42]

I am trying to send a string to the module mappy but I get this error: AttributeError("'PyCall.jlwrap' object has no attribute 'encode'"). I am using julia 1.4.

Here is my code:

using PyCall
using FASTX
using CodecZlib

py"""
import mappy as mp

def aligner(name,preset,threads):
    aligner = mp.Aligner(name,preset=preset,n_threads = threads)
    return aligner

def mappy(seq,aligner):
    try:
        line = next(aligner.map(seq))
        return False
    except StopIteration:
        return True
"""
aligner = py"aligner"("genome.idx","sr",4)
for record in FASTQ.Reader(GzipDecompressorStream(open("data_file.fastq.gz")))
    check = py"mappy"(sequence(record),aligner)

end
close(reader)

Here is the error:

ERROR: LoadError: PyError ($(Expr(:escape, :(ccall(#= /home/cedric/.julia/packages/PyCall/BD546/src/pyfncall.jl:43 =# @pysym(:PyObject_Call), PyPtr, (PyPtr, PyPtr, PyPtr), o, pyargsptr, kw))))) <class 'AttributeError'>
AttributeError("'PyCall.jlwrap' object has no attribute 'encode'")
  File "/home/cedric/.julia/packages/PyCall/BD546/src/pyeval.jl", line 9, in mappy
    if m === Main
  File "python/mappy.pyx", line 184, in map

Stacktrace:
 [1] pyerr_check at /home/cedric/.julia/packages/PyCall/BD546/src/exception.jl:62 [inlined]
 [2] pyerr_check at /home/cedric/.julia/packages/PyCall/BD546/src/exception.jl:66 [inlined]
 [3] _handle_error(::String) at /home/cedric/.julia/packages/PyCall/BD546/src/exception.jl:83
 [4] macro expansion at /home/cedric/.julia/packages/PyCall/BD546/src/exception.jl:97 [inlined]
 [5] #107 at /home/cedric/.julia/packages/PyCall/BD546/src/pyfncall.jl:43 [inlined]
 [6] disable_sigint at ./c.jl:446 [inlined]
 [7] __pycall! at /home/cedric/.julia/packages/PyCall/BD546/src/pyfncall.jl:42 [inlined]
 [8] _pycall!(::PyObject, ::PyObject, ::Tuple{BioSequences.LongSequence{BioSequences.DNAAlphabet{4}},PyObject}, ::Int64, ::Ptr{Nothing}) at /home/cedric/.julia/packages/PyCall/BD546/src/pyfncall.jl:29
 [9] _pycall!(::PyObject, ::PyObject, ::Tuple{BioSequences.LongSequence{BioSequences.DNAAlphabet{4}},PyObject}, ::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}) at /home/cedric/.julia/packages/PyCall/BD546/src/pyfncall.jl:11
 [10] (::PyObject)(::BioSequences.LongSequence{BioSequences.DNAAlphabet{4}}, ::Vararg{Any,N} where N; kwargs::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}) at /home/cedric/.julia/packages/PyCall/BD546/src/pyfncall.jl:86
 [11] (::PyObject)(::BioSequences.LongSequence{BioSequences.DNAAlphabet{4}}, ::Vararg{Any,N} where N) at /home/cedric/.julia/packages/PyCall/BD546/src/pyfncall.jl:86
 [12] top-level scope at /home/cedric/julia_fasto/fastolyse.jl:32
 [13] include(::Module, ::String) at ./Base.jl:377
 [14] exec_options(::Base.JLOptions) at ./client.jl:288
 [15] _start() at ./client.jl:484
in expression starting at /home/cedric/julia_fasto/fastolyse.jl:31

thank you