Fluka input not running in UBUNTU 18.04

Dear Expert,
I have UBUNTU 18.04
gfortran and gcc version: 7.5.0-3 ubuntu1~18.04

I have installed fluka-2011-3.0.Linux-gfor7_amd64.deb
It is installed in root : /usr/local/fluka and Flair is also installed in /usr/local/fluka
When I am trying to run fluka input through flair, I am getting the following error…

Program received signal SIGFPE: Floating-point exception - erroneous arithmetic operation.

Backtrace for this error:
#0 0x7f08a195532a
#1 0x7f08a1954503
#2 0x7f08a0d91f1f
#3 0x61eea0
#4 0x85d5c2
#5 0x845d06
#6 0x6945ee
#7 0x5ea50a
#8 0x4a01af
#9 0x404700
#10 0x4023b2
#11 0x7f08a0d74b96
#12 0x402469
#13 0xffffffffffffffff
Floating point exception (core dumped)

I am not able to solve the issue. kindly give me suggestion how to overcome the issue.

Thanking you in advance.

Please give a look in the .log or the .out files maybe you can find more information there on what is the problem. Also it would be nice to send us the .inp and/or the .flair files so we could debug the problem.

Thank you very much for giving attention to my problem.
please my .inp file below (I am not able to upload attachment as it is showing warning that " new user cannot upload attachment")


* Set the defaults for precision simulations
DEFAULTS                                                              PRECISIO
* Define the beam characteristics
BEAM        -0.00125                                                  PHOTON
* Define the beam position
BEAMPOS                              -5.
GEOBEGIN                                                              COMBNAME
    0    0          
* Black body
SPH blkbody    0.0 0.0 0.0 100000.0
* Void sphere
SPH void       0.0 0.0 0.0 10000.0
* Cylindrical target
RCC target     0.0 0.0 0.0 0.0 0.0 10.0 5.0
* Black hole
BLKBODY      5 +blkbody -void
* Void around
VOID         5 +void -target
* Target
TARGET       5 +target
* ..+....1....+....2....+....3....+....4....+....5....+....6....+....7..
ASSIGNMA      COPPER    TARGET                            2.
USRBIN           12.      DOSE      -22.    TARGET
USRBIN        TARGET                                                   &
* Set the random number seed
RANDOMIZ         1.0
* Set the number of primary histories to be simulated in the run

see my preference setting in flair: Screenshot from 2020-01-03 21-16-29|690x388

kindly advise me. Where I am doing mistake.
Thanking you in advance.

Dear ArghyaC,

the problem is with the line:

ASSIGNMA      COPPER    TARGET                            2.

The number 2. in the WHAT(5) position should be indicating electric field, but it is not yet implemented.
After deleting it, I was able to run your input file.

Thank you very much. Now it is running.