new_Decoder returned -1

[iProMC]

Hello I have a problem with my project when i which is : new_Decoder returned -1
IDK why it keeps happening can anyone help me !!

grammar_file = "contact" # do not use any extension for this file
model_path = "\env\Lib\site-packages\speech_recognition\pocketsphinx-data\en-US"
language = "en-US"

grammar_path = os.path.join(model_path, language, rootdir3 + "\contact.gram")
fsg_path = "{}.fsg".format(grammar_path)

print("Grammar Filepath: {}".format(grammar_path))
print("FSG Grammar Filepath: {}".format(fsg_path))

Create decoder object

config = pocketsphinx.Decoder.default_config()
config.set_string("-hmm", os.path.join(model_path, language, 'acoustic-model'))
config.set_string("-lm", os.path.join(model_path, language, 'language-model.lm.bin'))
config.set_string("-dict", os.path.join(model_path, language, 'pronounciation-dictionary.dict'))
config.set_string("-logfn", os.devnull)
decoder = pocketsphinx.Decoder(config)

Compile Grammar File

jsgf = Jsgf(grammar_path)
rule_string = "{0}.{0}".format(grammar_file)
rule = jsgf.get_rule(rule_string)
fsg = jsgf.build_fsg(rule, decoder.get_logmath(), 7.5)
fsg.writefile(fsg_path)

Set grammar to decoder

decoder.set_fsg(grammar_file, fsg)
decoder.set_search(grammar_file)

[iProMC]

the error on this (( decoder = pocketsphinx.Decoder(config) ))