diff --git a/api/config.py b/api/config.py
index a4a2afe1e..f1cc31d55 100644
--- a/api/config.py
+++ b/api/config.py
@@ -23,7 +23,7 @@
 logging.getLogger('requests').setLevel(logging.WARNING) # silence Requests library
 logging.getLogger('paste.httpserver').setLevel(logging.WARNING) # silence Paste library
 logging.getLogger('elasticsearch').setLevel(logging.WARNING) # silence Elastic library
-
+logging.getLogger('urllib3').setLevel(logging.WARNING) # silence urllib3 library
 
 # NOTE: Keep in sync with environment variables in sample.config file.
 DEFAULT_CONFIG = {
diff --git a/api/files.py b/api/files.py
index d781f86ce..5e3da5a34 100644
--- a/api/files.py
+++ b/api/files.py
@@ -18,8 +18,9 @@ class FileProcessor(object):
     def __init__(self, base, presistent_fs):
         self.base = base
         self._tempdir_name = str(uuid.uuid4())
-        self._temp_fs = fs.subfs.SubFS(presistent_fs, fs.path.join('tmp', self._tempdir_name))
         self._presistent_fs = presistent_fs
+        self._presistent_fs.makedirs(fs.path.join('tmp', self._tempdir_name), recreate=True)
+        self._temp_fs = fs.subfs.SubFS(presistent_fs, fs.path.join('tmp', self._tempdir_name))
 
     def store_temp_file(self, src_path, dest_path):
         if not isinstance(src_path, unicode):
diff --git a/api/handlers/listhandler.py b/api/handlers/listhandler.py
index 2493e1065..d3f2f0fba 100644
--- a/api/handlers/listhandler.py
+++ b/api/handlers/listhandler.py
@@ -1,3 +1,4 @@
+import os
 import bson
 import copy
 import datetime
diff --git a/raml/schemas/definitions/analysis.json b/raml/schemas/definitions/analysis.json
deleted file mode 100644
index e69de29bb..000000000
diff --git a/raml/schemas/definitions/file.json b/raml/schemas/definitions/file.json
deleted file mode 100644
index e69de29bb..000000000
diff --git a/swagger/schemas/definitions/file.json b/swagger/schemas/definitions/file.json
index f6cc81590..2dbe43b14 100644
--- a/swagger/schemas/definitions/file.json
+++ b/swagger/schemas/definitions/file.json
@@ -1,6 +1,7 @@
 {
     "$schema": "http://json-schema.org/draft-04/schema#",
     "definitions":{
+        "_id":            { "type": "string" },
         "name":           { "type": "string" },
         "file-type":      { "type": "string" },
         "mimetype":       { "type": "string" },
@@ -44,6 +45,7 @@
         "file": {
           "type": "object",
           "properties": {
+            "_id":           {"$ref":"#/definitions/_id"},
             "name":           {"$ref":"#/definitions/name"},
             "type":           {"$ref":"#/definitions/file-type"},
             "mimetype":       {"$ref":"#/definitions/mimetype"},
diff --git a/tests/integration_tests/python/test_resolver.py b/tests/integration_tests/python/test_resolver.py
index 8a32629ee..b772a03d0 100644
--- a/tests/integration_tests/python/test_resolver.py
+++ b/tests/integration_tests/python/test_resolver.py
@@ -177,10 +177,10 @@ def idz(s):
         return '<id:' + s + '>'
 
     # resolve root/group/project/session/acquisition/file with id
-    r = as_admin.post('/resolve', json={'path': [idz(group), idz(project), idz(session), idz(acquisition), acquisition_file]})
+    r = as_admin.post('/resolve', json={'path': [idz(group), idz(project), idz(session), idz(acquisition), idz(acquisition_file)]})
     result = r.json()
     assert r.ok
-    assert path_in_result([group, project, session, acquisition, acquisition_file], result)
+    assert path_in_result([group, project, session, acquisition, acquisition_file_id], result)
     assert result['children'] == []
 
     # try to resolve non-existent root/group/project/session/acquisition/child