HDF5 call 'file = H5Fopen(nuceos_table_name, H5F_ACC_RDONLY, H5P_DEFAULT)' returned error code -1 - hdf5

Question

when I run an executable on Linux I met an error I'm not able to explain. The executable is meant to read an .h5 file whose name is given by the nuceos_table_name variable. I already checked the filename and should be right i.e. nuceos_table_name = "./BLH_new.h5", the file is in the same folder where I launch the command from ("srun <path-to-executable>"). The error is the following
HDF5-DIAG: Error detected in HDF5 (1.12.0) thread 0:
#000: H5F.c line 793 in H5Fopen(): unable to open file
major: File accessibility
minor: Unable to open file
HDF5-DIAG: Error detected in HDF5 (1.12.0) thread 0:
HDF5-DIAG: Error detected in HDF5 (1.12.0) thread 0:
#000: H5F.c line 793 in H5Fopen(): unable to open file
major: File accessibility
minor: Unable to open file
HDF5-DIAG: Error detected in HDF5 (1.12.0) thread 0:
#000: H5F.c line 793 in H5Fopen(): unable to open file
major: File accessibility
minor: Unable to open file
#001: H5VLcallback.c line 3500 in H5VL_file_open(): open failed
major: Virtual Object Layer
minor: Can't open object
Thank you for helping and sorry if I haven't been clear enough, I'm new to this computer science stuff, anyway I'm here to explain better.
P.S. The code fragment which opens the file is the following:
void nuc_eos_C_ReadTable(const cGH* cctkGH)
{
DECLARE_CCTK_PARAMETERS;
using namespace nuc_eos;
using namespace nuc_eos_private;
CCTK_VInfo(CCTK_THORNSTRING,"*******************************");
CCTK_VInfo(CCTK_THORNSTRING,"Reading nuc_eos table file:");
CCTK_VInfo(CCTK_THORNSTRING,"%s",nuceos_table_name);
CCTK_VInfo(CCTK_THORNSTRING,"*******************************");
CCTK_INT my_reader_process = reader_process;
if (my_reader_process < 0 || my_reader_process >= CCTK_nProcs(cctkGH))
{
CCTK_VWarn(CCTK_WARN_COMPLAIN, __LINE__, __FILE__, CCTK_THORNSTRING,
"Requested IO process %d out of range. Reverting to process 0.", my_reader_process);
my_reader_process = 0;
}
const int doIO = !read_table_on_single_process || CCTK_MyProc(cctkGH) == my_reader_process;
hid_t file;
if (doIO && !file_is_readable(nuceos_table_name)) {
CCTK_VError(__LINE__, __FILE__, CCTK_THORNSTRING,
"Could not read nuceos_table_name %s \n",
nuceos_table_name);
}
HDF5_DO_IO(file = H5Fopen(nuceos_table_name, H5F_ACC_RDONLY, H5P_DEFAULT));
// Use these two defines to easily read in a lot of variables in the same way
// The first reads in one variable of a given type completely