Error in fopen

[Mdha006]

Hi there,
Trying to read in illumina pe files but get the following error

error during fopen

Stdout pipes the following:

--- Uniform kmers sampling. 

--- h(0):m(24):s(39) elapsed time.
--- total number of kmers in BloomA = 9748157907
--- BloomA false positive rate = 6.23896e-05
--- average read length = 145
--- average sequencing coverage = 14
--- probability of an incorrect kmer appears in the sample : 0.00181075

Command options:

./LightAssembler -k 31 -g 8 -e 0.001 -G 6500000000 -o "{$outdir}"/weta_31 -t 16 read1.fq.gz read2.fq.gz

Thanks !