Explanation: If the flow has nodes with ESQL statements,
the flow might not deploy even if the statements are syntactically correct. This can occur, for example, because of multiple declarations or
uninitialized variables (that is, semantic problems that the syntax parser
does not pick up). Always check the workbench Event
Log to confirm that the debug version of your flow has deployed; it has the
same name as the original flow, with the suffix _debug_ added.If
the flow does not deploy properly, the debugger cannot establish communication
with the flow, and you get the endless progress bar.