diff --git a/jedi/api/__init__.py b/jedi/api/__init__.py
index 24196abd..9f742ad4 100644
--- a/jedi/api/__init__.py
+++ b/jedi/api/__init__.py
@@ -121,7 +121,7 @@ class Script(object):
             project = get_default_project()
         # TODO deprecate and remove sys_path from the Script API.
         project._sys_path = sys_path
-        self._evaluator = Evaluator(project, environment)
+        self._evaluator = Evaluator(project, environment=environment, script_path=path)
         self._project = project
         debug.speed('init')
 
diff --git a/jedi/api/project.py b/jedi/api/project.py
index 1f037065..e3e092a0 100644
--- a/jedi/api/project.py
+++ b/jedi/api/project.py
@@ -87,12 +87,12 @@ class Project(object):
         one is used like a public method.
         """
         sys_path = list(self._get_base_sys_path(environment))
-        if self._smart_sys_path:
+        if evaluator.script_path is None or not self._smart_sys_path:
             return sys_path
 
         added_paths = map(
             force_unicode,
-            detect_additional_paths(self._evaluator, self._script_path)
+            detect_additional_paths(evaluator, evaluator.script_path)
         )
         return sys_path + list(added_paths)
 
diff --git a/jedi/evaluate/__init__.py b/jedi/evaluate/__init__.py
index aba15f36..2c1bb397 100644
--- a/jedi/evaluate/__init__.py
+++ b/jedi/evaluate/__init__.py
@@ -67,7 +67,6 @@ import parso
 
 from jedi import debug
 from jedi import parser_utils
-from jedi.api.environment import get_default_environment
 from jedi.evaluate.utils import unite
 from jedi.evaluate import imports
 from jedi.evaluate import recursion
@@ -85,10 +84,11 @@ from jedi.evaluate.syntax_tree import eval_trailer, eval_expr_stmt, \
 
 
 class Evaluator(object):
-    def __init__(self, project, environment=None):
+    def __init__(self, project, environment=None, script_path=None):
         if environment is None:
-            environment = get_default_environment()
+            environment = project.get_environment()
         self.environment = environment
+        self.script_path = script_path
         self.compiled_subprocess = environment.get_evaluator_subprocess(self)
         self.grammar = environment.get_grammar()
 
diff --git a/jedi/evaluate/compiled/subprocess/__init__.py b/jedi/evaluate/compiled/subprocess/__init__.py
index eff9db9d..4cceadc8 100644
--- a/jedi/evaluate/compiled/subprocess/__init__.py
+++ b/jedi/evaluate/compiled/subprocess/__init__.py
@@ -13,6 +13,7 @@ import subprocess
 import socket
 import errno
 import weakref
+import traceback
 from functools import partial
 
 from jedi._compatibility import queue, is_py3, force_unicode, pickle_dump, pickle_load
@@ -195,12 +196,15 @@ class _CompiledSubprocess(object):
             raise InternalError("The subprocess was killed. Maybe out of memory?")
 
         try:
-            is_exception, result = pickle_load(self._process.stdout)
+            is_exception, traceback, result = pickle_load(self._process.stdout)
         except EOFError:
             self.kill()
             raise InternalError("The subprocess crashed.")
 
         if is_exception:
+            # Replace the attribute error message with a the traceback. It's
+            # way more informative.
+            result.args = (traceback,)
             raise result
         return result
 
@@ -270,11 +274,9 @@ class Listener(object):
                 # here and just exit.
                 exit(1)
             try:
-                result = False, self._run(*payload)
+                result = False, None, self._run(*payload)
             except Exception as e:
-                #import traceback
-                #print_to_stderr(traceback.format_exc())
-                result = True, e
+                result = True, traceback.format_exc(), e
 
             pickle_dump(result, file=stdout)
             stdout.flush()
diff --git a/jedi/evaluate/imports.py b/jedi/evaluate/imports.py
index 3ed7bb20..ba37dc44 100644
--- a/jedi/evaluate/imports.py
+++ b/jedi/evaluate/imports.py
@@ -517,10 +517,11 @@ def get_modules_containing_name(evaluator, modules, name):
         with open(path, 'rb') as f:
             code = python_bytes_to_unicode(f.read(), errors='replace')
             if name in code:
-                module = _load_module(evaluator, path, code)
+                e_sys_path = evaluator.get_sys_path()
+                module = _load_module(evaluator, path, code, sys_path=e_sys_path)
 
                 module_name = sys_path.dotted_path_in_sys_path(
-                    evaluator.get_sys_path(), path
+                    e_sys_path, path
                 )
                 if module_name is not None:
                     add_module(evaluator, module_name, module)
diff --git a/test/test_api/test_environment.py b/test/test_api/test_environment.py
index 0372a1c6..fc02c990 100644
--- a/test/test_api/test_environment.py
+++ b/test/test_api/test_environment.py
@@ -43,7 +43,10 @@ def test_versions(version):
 
 
 def test_load_module(evaluator):
-    access_path = evaluator.compiled_subprocess.load_module(name=u'math')
+    access_path = evaluator.compiled_subprocess.load_module(
+        name=u'math',
+        sys_path=evaluator.get_sys_path()
+    )
     name, access_handle = access_path.accesses[0]
 
     assert access_handle.py__bool__() is True