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AM335x PRU clpru invalid instruction

I'm use clpru to assemble some code[1] for the PRU.  Unfortunately I'm getting the following error:

QBBS A_CHANGED, r0.t0

"pru0-encoder.asm", ERROR! at line 103: [E0003] Invalid instruction
QBBS A_CHANGED, r0.t0

I can't figure out what is invalid about QBBS?  

I'm running on a BeagleBone with version 2.1.2 of clpru.

clpru -version
PRU C/C++ Compiler v2.1.2
Build Number 1PL7P-2LI-UAYAS-TAQ-ZARUGU

PRU EABI C/C++ Parser v2.1.2
Build Number 1PL7P-2LI-UAYAS-TAQ-ZARUGU
PRU C/C++ File Merge v2.1.2
Build Number 1PL7P-2LI-UAYAS-TAQ-ZARUGU
PRU C/C++ Optimizer v2.1.2
Build Number 1PL7P-2LI-UAYAS-TAQ-ZARUGU
PRU C/C++ Codegen v2.1.2
Build Number 1PLBO-0QRTSXTX-UAYAS-TAR-ZARUGU
PRU Assembler v2.1.2
Build Number 1PL7P-2LI-UAYAS-TAQ-ZARUGU
PRU Embed Utility v2.1.2
Build Number 1PL7P-2LI-UAYAS-TAQ-ZARUGU
PRU C Source Interlister v2.1.2
Build Number 1PL7P-2LI-UAYAS-TAQ-ZARUGU
PRU Linker v2.1.2
Build Number 1PL7Q-2LI-UAYAS-TAQ-ZARUGU
PRU Absolute Lister v2.1.2
Build Number 1PL7P-2LI-UAYAS-TAQ-ZARUGU
PRU Strip Utility v2.1.2
Build Number 1PL7P-2LI-UAYAS-TAQ-ZARUGU
PRU XREF Utility v2.1.2
Build Number 1PL7P-2LI-UAYAS-TAQ-ZARUGU
PRU C++ Demangler v2.1.2
Build Number 1PL7P-2LI-UAYAS-TAQ-ZARUGU
PRU Hex Converter v2.1.2
Build Number 1PL7P-2LI-UAYAS-TAQ-ZARUGU
PRU Name Utility v2.1.2
Build Number 1PL7P-2LI-UAYAS-TAQ-ZARUGU
PRU Object File Display v2.1.2
Build Number 1PL7P-2LI-UAYAS-TAQ-ZARUGU
PRU Archiver v2.1.2
Build Number 1PL7P-2LI-UAYAS-TAQ-ZARUGU

--Mark

[1] github.com/.../pru0-encoder.asm