When $fl_precision is 16, floating point registers may only
be referenced via an even based pair of flregs (i.e. $fr0, $frb2)
Explanation
The user tried to assign or print a value to an
odd floating point register when $fl_precision was 16. The register
pair must start with an even floating point register in this case.
User response
Respecify the command with an even floating point
register