warning/errors with system_level_score_A.pl

[nicolabertoldi]

After modifying the hardcoded filenames, langpair and task name,
I tried with a toy example containing the following 7 sentences

HYP

ciao ciao ciao ciao Ciao!
Ciao!
Ciao !
Ciao!
Ciao !
Addio!
Addio !

REF

ciao ciao ciao ciao Ciao!
Ciao!
Ciao !
Addio!
Addio !
Addio !
Addio!

I got this output with lots of warnings or errors, the results for each single sentence,
but no global results.

$>  perl system_level_score_A.pl 
Use of uninitialized value within @common_num in numeric ne (!=) at system_level_score_A.pl line 151.
Use of uninitialized value within @common_num in numeric ne (!=) at system_level_score_A.pl line 151.
Use of uninitialized value within @common_num in numeric ne (!=) at system_level_score_A.pl line 151.
Use of uninitialized value in string eq at system_level_score_A.pl line 224.
Use of uninitialized value in string eq at system_level_score_A.pl line 224.
Use of uninitialized value in addition (+) at system_level_score_A.pl line 340.
Use of uninitialized value in addition (+) at system_level_score_A.pl line 340.
Use of uninitialized value in addition (+) at system_level_score_A.pl line 340.
Use of uninitialized value in addition (+) at system_level_score_A.pl line 340.
Use of uninitialized value in addition (+) at system_level_score_A.pl line 340.
Use of uninitialized value in addition (+) at system_level_score_A.pl line 340.
Use of uninitialized value in addition (+) at system_level_score_A.pl line 340.
LEPOR-1	en__it	xxx	prova.it	0.517630550898623	No	poethan.github.com

Am I doing anything wrong?