Some questions about caffe model

[huakaibanmu]

After I install caffe successfully，when I try to import caffe in python ，one error occurs：
Traceback (most recent call last): File "online_recognition.py", line 4, in <module> import caffe File "/root/ECO4/caffe_3d/python/caffe/__init__.py", line 1, in <module> from .pycaffe import Net, SGDSolver File "/root/ECO4/caffe_3d/python/caffe/pycaffe.py", line 13, in <module> from ._caffe import Net, SGDSolver ImportError: /root/ECO4/caffe_3d/python/caffe/_caffe.so: invalid ELF header

before I compile caffe，I changed Makefile.config about PYTHONPATH and the path of protobuf,and I have added the following line:
export PYTHONPATH=/root/ECO2/caffe_3d/python:$PYTHONPATH
I google it and someone says I installed the wrong version，can anyone help me？ thx！