diff --git a/resources/subjects/tests/test_error/main.py b/resources/subjects/tests/test_error/main.py
new file mode 100644
index 0000000..dd1624f
--- /dev/null
+++ b/resources/subjects/tests/test_error/main.py
@@ -0,0 +1,21 @@
+import sys
+
+
+def f(x: int):
+    if x < 0:
+        raise ValueError("x must be non-negative")
+    else:
+        return x
+
+
+def g(x: int):
+    if x < 0:
+        return -x
+    else:
+        return x
+
+
+if __name__ == "__main__":
+    x_ = int(sys.argv[1])
+    g(x_)
+    f(x_)
diff --git a/src/sflkit/analysis/factory.py b/src/sflkit/analysis/factory.py
index 983ca87..6f2dd3e 100644
--- a/src/sflkit/analysis/factory.py
+++ b/src/sflkit/analysis/factory.py
@@ -18,6 +18,7 @@
     ContainsDigitPredicate,
     ContainsSpecialPredicate,
     EmptyBytesPredicate,
+    FunctionErrorPredicate,
 )
 from sflkit.analysis.spectra import Line, Function, Loop, DefUse, Length
 from sflkit.model.scope import Scope
@@ -429,6 +430,29 @@ def get_analysis(self, event, scope: Scope = None) -> List[AnalysisObject]:
             return self.objects[key][:]
 
 
+class FunctionErrorFactory(AnalysisFactory):
+    def __init__(self):
+        super().__init__()
+        self.function_mapping = dict()
+
+    def get_analysis(self, event, scope: Scope = None) -> List[AnalysisObject]:
+        if event.event_type == EventType.FUNCTION_ENTER:
+            self.function_mapping[event.function_id] = event.line
+        if event.event_type in (EventType.FUNCTION_ERROR, EventType.FUNCTION_EXIT):
+            line = self.function_mapping[event.function_id]
+            key = (
+                FunctionErrorPredicate.analysis_type(),
+                event.file,
+                line,
+                event.function_id,
+            )
+            if key not in self.objects:
+                self.objects[key] = FunctionErrorPredicate(
+                    event.file, line, event.function
+                )
+            return [self.objects[key]]
+
+
 analysis_factory_mapping = {
     AnalysisType.LINE: LineFactory,
     AnalysisType.BRANCH: BranchFactory,
@@ -446,4 +470,5 @@ def get_analysis(self, event, scope: Scope = None) -> List[AnalysisObject]:
     AnalysisType.VARIABLE: VariableFactory,
     AnalysisType.SCALAR_PAIR: ScalarPairFactory,
     AnalysisType.FUNCTION: FunctionFactory,
+    AnalysisType.FUNCTION_ERROR: FunctionErrorFactory,
 }
diff --git a/src/sflkit/analysis/mapping.py b/src/sflkit/analysis/mapping.py
index a6bfccb..8765a1b 100644
--- a/src/sflkit/analysis/mapping.py
+++ b/src/sflkit/analysis/mapping.py
@@ -6,6 +6,7 @@
     VariablePredicate,
     ReturnPredicate,
     NonePredicate,
+    FunctionErrorPredicate,
 )
 from sflkit.analysis.predicate import (
     EmptyStringPredicate,
@@ -39,6 +40,7 @@
 analysis_mapping[AnalysisType.DIGIT_STRING] = ContainsDigitPredicate
 analysis_mapping[AnalysisType.SPECIAL_STRING] = ContainsSpecialPredicate
 analysis_mapping[AnalysisType.CONDITION] = Condition
+analysis_mapping[AnalysisType.FUNCTION_ERROR] = FunctionErrorPredicate
 
 """
 If you want to add new spectra or predicates, please register them here and in sdtools/analysis/analysis_type.py
diff --git a/src/sflkit/language/meta.py b/src/sflkit/language/meta.py
index cd07c10..722b85a 100644
--- a/src/sflkit/language/meta.py
+++ b/src/sflkit/language/meta.py
@@ -61,7 +61,7 @@ def __init__(self):
         self.random = random.randbytes(4).hex()
 
     def get_var_name(self):
-        var = f"sd_tmp_{self.random}_{self._tmp_count}"
+        var = f"sk_tmp_{self.random}_{self._tmp_count}"
         self._tmp_count += 1
         return var
 
diff --git a/src/sflkit/language/python/factory.py b/src/sflkit/language/python/factory.py
index 5fb86b9..66a0a79 100644
--- a/src/sflkit/language/python/factory.py
+++ b/src/sflkit/language/python/factory.py
@@ -521,7 +521,7 @@ def visit_function(
         function_error_event = FunctionErrorEvent(
             self.file,
             node.lineno,
-            self.get_function_event_id(node, self.event_id_generator),
+            self.event_id_generator.get_next_id(),
             node.name,
             self.get_function_id(node),
         )
diff --git a/src/sflkit/mapping.py b/src/sflkit/mapping.py
index bb54263..8fd3260 100644
--- a/src/sflkit/mapping.py
+++ b/src/sflkit/mapping.py
@@ -27,12 +27,16 @@ def get_path(identifier: str):
     def load(config: Any):
         if not hasattr(config, "identifier"):
             raise InstrumentationError(f"Argument does not have an identifier")
-        file = EventMapping.get_path(config.identifier())
+        return EventMapping.load_from_file(config.identifier())
+
+    @staticmethod
+    def load_from_file(identifier: str):
+        file = EventMapping.get_path(identifier)
         if file.exists():
             return EventMapping(load_json(file))
         else:
             raise InstrumentationError(
-                f"Cannot find information about instrumentation of {config.identifier()}"
+                f"Cannot find information about instrumentation of {identifier or file}"
             )
 
     def write(self, config):