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1.5i PAR - INTERNAL_ERROR:baspl:basplbscore.c:614:1.21
INTERNAL_ERROR:baspl:basplbscore.c:614:1.21 - attempting to provisionally place multiplecomps in the same site.
This error is known to occur in the high density placer (4085xl and larger) on some designs that have PULLUPs on TBUF nets.
The work around is to LOC (or remove) the PULLUPs.
A fix is scheduled for version 2.1i due to begin shipping in June.