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## ModelNotFound Objects [#](https://legacy-docs-oss.rasa.com/docs/rasa/2.x/reference/rasa/exceptions/#modelnotfound-objects "Direct link to heading")

```python
class ModelNotFound(RasaException)
```

Raised when a model is not found in the path provided by the user.

## NoEventsToMigrateError Objects [#](https://legacy-docs-oss.rasa.com/docs/rasa/2.x/reference/rasa/exceptions/#noeventstomigrateerror-objects "Direct link to heading")

```python
class NoEventsToMigrateError(RasaException)
```

Raised when no events to be migrated are found.

## NoConversationsInTrackerStoreError Objects [#](https://legacy-docs-oss.rasa.com/docs/rasa/2.x/reference/rasa/exceptions/#noconversationsintrackerstoreerror-objects "Direct link to heading")

```python
class NoConversationsInTrackerStoreError(RasaException)
```

Raised when a tracker store does not contain any conversations.

## NoEventsInTimeRangeError Objects [#](https://legacy-docs-oss.rasa.com/docs/rasa/2.x/reference/rasa/exceptions/#noeventsintimerangeerror-objects "Direct link to heading")

```python
class NoEventsInTimeRangeError(RasaException)
```

Raised when a tracker store does not contain events within a given time range.

## MissingDependencyException Objects [#](https://legacy-docs-oss.rasa.com/docs/rasa/2.x/reference/rasa/exceptions/#missingdependencyexception-objects "Direct link to heading")

```python
class MissingDependencyException(RasaException)
```

Raised if a python package dependency is needed, but not installed.

## PublishingError Objects [#](https://legacy-docs-oss.rasa.com/docs/rasa/2.x/reference/rasa/exceptions/#publishingerror-objects "Direct link to heading")

```python
class PublishingError(RasaException)
```

Raised when publishing of an event fails.

**Attributes**:

- `timestamp` - Unix timestamp of the event during which publishing fails.

#### __str__ [#](https://legacy-docs-oss.rasa.com/docs/rasa/2.x/reference/rasa/exceptions/#__str__ "Direct link to heading")

```python
def __str__() -> Text
```

Returns string representation of exception.