Try using sample Group info Encounter AttributeError about module 'pulp' - snakemake

Question

Snakemake version
5.25.0
Describe the bug
I am trying construct a rule by group merge-like operation . dry-run is ok, but snakemake -p -j1 failed with this ERROR
AttributeError: module 'pulp' has no attribute 'apis'
Logs
Building DAG of jobs...
Using shell: /usr/bin/bash
Provided cores: 1 (use --cores to define parallelism)
Rules claiming more threads will be scaled down.
Job counts:
count jobs
2 IDRPeakMerge
1 all
3
Traceback (most recent call last):
File ".../miniconda3/lib/python3.7/site-packages/snakemake/__init__.py", line 735, in snakemake
keepincomplete=keep_incomplete,
File ".../miniconda3/lib/python3.7/site-packages/snakemake/workflow.py", line 972, in execute
success = scheduler.schedule()
File ".../miniconda3/lib/python3.7/site-packages/snakemake/scheduler.py", line 406, in schedule
else self.job_selector_ilp(needrun)
File ".../miniconda3/lib/python3.7/site-packages/snakemake/scheduler.py", line 616, in job_selector_ilp
if pulp.apis.LpSolverDefault is None:
AttributeError: module 'pulp' has no attribute 'apis'
Minimal example
SAMPLES = {
'group1':["SRR1552451","SRR1552453","ERR127302"],
'group2':["ERR127302","SRR1552452"]
}
rule all:
input:
expand('idr/{group}.idr.peak',group=list(SAMPLES.keys()))
rule IDRPeakMerge:
input:
lambda wildcards: expand('macs2/{sample}.summits.bed', sample=SAMPLES[wildcards.group])
output:
'idr/{group}.idr.peak'
run:
shell("head -n 1 {input} >> {output} ")
Additional context
file tree
s03peaks
├── idr
└── macs2
├── ERR127302.summits.bed
├── SRR1552451.summits.bed
├── SRR1552452.summits.bed
└── SRR1552453.summits.bed