This error occurs when an array is specified as a sequence of unformatted input/output statements and the array size is large.
It can be identified by specifying the following compiler options and runtime environment variables.
* The error file and the number of lines will be displayed as shown below:

example)
$ nfort main.f90 -g -traceback=verbose
$ export VE_TRACEBACK=VERBOSE
$ ./a.out
Runtime Error: Cannot allocate memory for environment variable VE_FORT_UFMTENDIAN.
Program terminated by fatal error
[ 0] 0x600c00a58910 ? ?:?
[ 1] 0x600c00a51b38 ? ?:?
[ 2] 0x600c00cd4c78 ? ?:?
[ 3] 0x60000001f850 MAIN main.f90:28 *
[ 4] 0x60000001fc80 ? ?:?
[ 5] 0x600c02a407a8 ? ?:?
[ 6] 0x600000002d00 ? ?:?