MINT file failed to be generated correctly: "Warning in generating construction graph edges"

[ryu-bu]

LFR code:

module antibiotic_resistance (
    finput A,
    foutput a_out
);
    storage [0:9] chamber;

    // send suspended cells to each chambers that contain different concentrations of antibiotics
    assign chamber[0:9] = A;

    // excess cells out
    assign a_out = A;

endmodule

Generated MINT file:

DEVICE antibiotic_resistance

LAYER FLOW 

PORT port_1 portRadius=2000 ;
PORT port_2 portRadius=2000 ;

 

END LAYER

Log:

['antibiotic_resistance.lfr']
output dir: out/
['antibiotic_resistance.lfr']
Initialized the lfrcompiler
LHS not equal to RHS
LHS, RHS sizes are equal
Name: A, Type : IOType.FLOW_INPUT Name: a_out, Type : IOType.FLOW_OUTPUT
Name : antibiotic_resistance
Name: A, Type : IOType.FLOW_INPUT
Name: a_out, Type : IOType.FLOW_OUTPUT

---Top of Stack---
---Bottom of Stack---
output: /home/ryu/CIDAR/LFR-TestCases/mars/out
output: /home/ryu/CIDAR/LFR-TestCases/mars/out/antibiotic_resistance.dot
Warning in generating Construction graph edges ! - Src `A` or Tar `chamber_0` not in the reverse-mapping of construction , under coverage issue
Warning in generating Construction graph edges ! - Src `A` or Tar `chamber_1` not in the reverse-mapping of construction , under coverage issue
Warning in generating Construction graph edges ! - Src `A` or Tar `chamber_2` not in the reverse-mapping of construction , under coverage issue
Warning in generating Construction graph edges ! - Src `A` or Tar `chamber_3` not in the reverse-mapping of construction , under coverage issue
Warning in generating Construction graph edges ! - Src `A` or Tar `chamber_4` not in the reverse-mapping of construction , under coverage issue
Warning in generating Construction graph edges ! - Src `A` or Tar `chamber_5` not in the reverse-mapping of construction , under coverage issue
Warning in generating Construction graph edges ! - Src `A` or Tar `chamber_6` not in the reverse-mapping of construction , under coverage issue
Warning in generating Construction graph edges ! - Src `A` or Tar `chamber_7` not in the reverse-mapping of construction , under coverage issue
Warning in generating Construction graph edges ! - Src `A` or Tar `chamber_8` not in the reverse-mapping of construction , under coverage issue
Warning in generating Construction graph edges ! - Src `A` or Tar `chamber_9` not in the reverse-mapping of construction , under coverage issue
Impement ConstructionGrpah:generate_flow_cn_edges method stub 
Impement ConstructionGrpah:generate_control_cn_edges method stub 
Implement the orphan io generation system