issue faced in smodels

[hdeka1]

Dear developers of SModels,

First of all thank you such an amazing package. I am writing to you regarding one of the issues I face in SModels. I generated the lhe file in MG-3.5.5 for the channel:
generate p p > bp bp~, (bp > hp2~ u, hp2~ > e- ne), (bp~ > hp2 u~, hp2 > e+ ~ne)

But, when I test the signal via ./runModels, I face the following error:

(base) hrishikesh@hrishikesh-OptiPlex-3000:~/Downloads/smodels-3.1.1$ ./runSModelS.py -f inputFiles/lhe/test.lhe -p parameters.ini -o results
INFO in databaseObj.loadBinaryFile() in 562: loading binary db file /home/hrishikesh/.cache/smodels/official311.pcl format version 214
INFO in databaseObj.loadBinaryFile() in 569: Loaded database from /home/hrishikesh/.cache/smodels/official311.pcl in 1.1 secs.
INFO in modelTester.testPoints() in 354: Running SModelS for a single file
Traceback (most recent call last):
File "/home/hrishikesh/Downloads/smodels-3.1.1/smodels/base/model.py", line 208, in getModelDataFrom
res = pyslha.readSLHAFile(inputFile)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/hrishikesh/anaconda3/lib/python3.11/site-packages/pyslha.py", line 1560, in readSLHAFile
return readSLHA(_read(spcfile), **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/hrishikesh/anaconda3/lib/python3.11/site-packages/pyslha.py", line 790, in readSLHA
sys.stderr.write("Ignoring unknown section type: %s\n" % line.split()[0])
^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'write'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/home/hrishikesh/Downloads/smodels-3.1.1/smodels/matching/modelTester.py", line 255, in runSingleFile
res = testPoint(inputFile, outputDir, parser, database)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/hrishikesh/Downloads/smodels-3.1.1/smodels/matching/modelTester.py", line 126, in testPoint
model.updateParticles(inputFile=inputFile,
File "/home/hrishikesh/Downloads/smodels-3.1.1/smodels/base/model.py", line 418, in updateParticles
massDict, decaysDict, xsections = self.getModelDataFrom(inputFile)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/hrishikesh/Downloads/smodels-3.1.1/smodels/base/model.py", line 220, in getModelDataFrom
massDict, decaysDict = lheReader.getDictionariesFrom(inputFile)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/hrishikesh/Downloads/smodels-3.1.1/smodels/base/lheReader.py", line 248, in getDictionariesFrom
eventMass,eventDecays = getDictionariesFromEvent(event)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/hrishikesh/Downloads/smodels-3.1.1/smodels/base/lheReader.py", line 355, in getDictionariesFromEvent
raise SModelSError("More than one parent particle found")
smodels.base.exceptions.SModelSBaseError: 'More than one parent particle found'

Will you please help me out how to resolve this issue?