self.assertEqual(14 + 14 * 2,float(stdout[0])) IndexError: list index out of range

[j143]

SCRIPT:
======================================================================
test_03 (tests.source.test_source_no_return.TestSource_NoReturn)
source("./tests/source/source_with_list_input.dml") as test
V1=matrix(2,rows=10,cols=10);
[V2_0,V2_1,V2_2]=scale(X=V1,center=TRUE,scale=TRUE);
V3=list(V2_0,V2_1,V2_2);
V4=test::func(a=V3);
V5=sum(V4);
write(V5, './tmp');

----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/runner/work/systemds/systemds/src/main/python/tests/source/test_source_no_return.py", line 59, in test_03
    self.assertEqual(14 + 14 * 2,float(stdout[0]))
IndexError: list index out of range