Reason: d cannot be resolved
Method Breakpoint
new String(d.getTag("Fully Qualified Name").getValue()).equals("TargetClass1.runIt.r2 = specialinvoke r0.<TargetClass1: java.lang.String doL3ak(java.lang.String)>(r1)")
I toggled a unit breakpoint in the jimple file of the target code, then this error showed.
I noticed that when i toggled a unit breakpoint the flow functions are also toggled, since i was using an inter-procedural taint analysis. I think the conditonal for the flow function breakpoints are not set correctly.