Can't build any LS file with a joint move, error code 0x160002

I've been automatically generating and compiling LS files into TP code for a while now with no issues, but I've just found a weird problem with timed joints moves. For context, I'm running the old 5.30 controller software version (compatibility for a customer with an old robot). Here's the LS file I'm trying to translate:

/PROG  COL_PLC1
/ATTR
PROTECT		= READ_WRITE;
TCD:  STACK_SIZE	= 0,
      TASK_PRIORITY	= 50,
      TIME_SLICE	= 0,
      BUSY_LAMP_OFF	= 0,
      ABORT_REQUEST	= 0,
      PAUSE_REQUEST	= 0;
DEFAULT_GROUP	= 1,*,*,*,*;
CONTROL_CODE	= 00000000 00000000;
/MN
	1:	J PR[1] 750msec CNT100 ACC100;
/POS

/END

and here's the error I get when building:

Quote

----------------------------------------------------------------------
Translating E:\plc_test\col_plc1.ls

Error occurred during load
E:\plc_test\col_plc1.ls(13)
on line 13, column 38
Undefined instruction
E:\plc_test\col_plc1.ls(13)
on line 13, column 31
Undefined instruction
Build Failed: Error translating program: Code: 0x160002: [SPRUNCMDF] status = 38000F; "ERSRCH 0X160002 " :
----------------------------------------------------------------------

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If I change to a linear move, this works fine. If I change the velocity type to percentage, like 1: J PR[1] 100% CNT100 ACC100;, it's fine. What's really weird is that if I open the teach pendant and change the program, I can make it a timed move, and I can even print out an LS file. But that same LS file then will not re-build.

Again this is with the old 5.30 software version, but does anyone have any idea about this?

Quote

For joint motions I only see % and sec.

So you can't even set the <msec> option? I can set it in the teach pendant, I just can't build an LS file that has it set. Very weird, but good to know that <sec> will probably work.