Fixed import

blink/messages.py

@@ -26,6 +26,7 @@ from sipsimple.configuration import DuplicateIDError
 from sipsimple.configuration.settings import SIPSimpleSettings
 from sipsimple.core import SIPURI, FromHeader, ToHeader, Message, RouteHeader
 from sipsimple.lookup import DNSLookup
+from sipsimple.payloads import ParserError
 from sipsimple.payloads.iscomposing import IsComposingDocument, IsComposingMessage, State, LastActive, Refresh, ContentType
 from sipsimple.payloads.imdn import IMDNDocument, DeliveryNotification, DisplayNotification
 from sipsimple.streams.msrp.chat import CPIMPayload, CPIMParserError, CPIMNamespace, CPIMHeader, ChatIdentity, Message as MSRPChatMessage, SimplePayload