Add traceback import

This makes it actually possible to print a traceback.

crossechoTangoDev/Crossecho.py

@@ -25,6 +25,7 @@ from PyTango import AttrWriteType, PipeWriteType
 # PROTECTED REGION ID(Crossecho.additionnal_import) ENABLED START #
 from opcua import Client
 import numpy
+import traceback
 # PROTECTED REGION END #    //  Crossecho.additionnal_import
 
 __all__ = ["Crossecho", "main"]