make unittests error

[striveman1379]

I got the following errors when make unittests

---

make unittests

nosetests -s
....E............................E...E...........E.......

ERROR: test_files_yextend.Test_Yextend_files.test_content_yara_7z_multiple_embed_pdf

Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/nose/case.py", line 197, in runTest
self.test(*self.arg)
File "/root/yextend-yara-3.8.1/test/test_files_yextend.py", line 1280, in test_content_yara_7z_multiple_embed_pdf
json_resp = json.loads(out)
File "/usr/lib/python2.7/json/init.py", line 339, in loads
return _default_decoder.decode(s)
File "/usr/lib/python2.7/json/decoder.py", line 364, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/usr/lib/python2.7/json/decoder.py", line 382, in raw_decode
raise ValueError("No JSON object could be decoded")
ValueError: No JSON object could be decoded

======================================================================
ERROR: test_files_yextend.Test_Yextend_files.test_content_yara_putty_multiple_embed_pdf

Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/nose/case.py", line 197, in runTest
self.test(*self.arg)
File "/root/yextend-yara-3.8.1/test/test_files_yextend.py", line 1409, in test_content_yara_putty_multiple_embed_pdf
json_resp = json.loads(out)
File "/usr/lib/python2.7/json/init.py", line 339, in loads
return _default_decoder.decode(s)
File "/usr/lib/python2.7/json/decoder.py", line 364, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/usr/lib/python2.7/json/decoder.py", line 382, in raw_decode
raise ValueError("No JSON object could be decoded")
ValueError: No JSON object could be decoded

======================================================================
ERROR: test_files_yextend.Test_Yextend_files.test_content_yara_putty_zip_multiple_embed_pdf

Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/nose/case.py", line 197, in runTest
self.test(*self.arg)
File "/root/yextend-yara-3.8.1/test/test_files_yextend.py", line 1489, in test_content_yara_putty_zip_multiple_embed_pdf
json_resp = json.loads(out)
File "/usr/lib/python2.7/json/init.py", line 339, in loads
return _default_decoder.decode(s)
File "/usr/lib/python2.7/json/decoder.py", line 364, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/usr/lib/python2.7/json/decoder.py", line 382, in raw_decode
raise ValueError("No JSON object could be decoded")
ValueError: No JSON object could be decoded

======================================================================
ERROR: test_files_yextend.Test_Yextend_files.test_yara_archive_rar_multiple_embed_pdf

Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/nose/case.py", line 197, in runTest
self.test(*self.arg)
File "/root/yextend-yara-3.8.1/test/test_files_yextend.py", line 1191, in test_yara_archive_rar_multiple_embed_pdf
json_resp = json.loads(out)
File "/usr/lib/python2.7/json/init.py", line 339, in loads
return _default_decoder.decode(s)
File "/usr/lib/python2.7/json/decoder.py", line 364, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/usr/lib/python2.7/json/decoder.py", line 382, in raw_decode
raise ValueError("No JSON object could be decoded")
ValueError: No JSON object could be decoded

---

Ran 57 tests in 11.787s

FAILED (errors=4)
Makefile:937: recipe for target 'unittests' failed
make: *** [unittests] Error 1