Nastran计算声模态时遇到的一个错误，跪求解答
用nastran进行声腔模态计算出现以下错误提示，请教高手
*** USER FATAL MESSAGE 2049 (GP4)
UNDEFINED GRID POINT 1 HAS A COORDINATE REFERENCED ON A CONSTRAINT CARD.
bdf文件如下
$ NASTRAN input file created by the Patran 2008r1 (MD Enabled) input
$ file translator on August 02, 2012 at 22:09:59.
$ Direct Text Input for Nastran System Cell Section
$ Direct Text Input for File Management Section
$ Normal Modes Analysis, Database
SOL 103
$ Direct Text Input for Executive Control
CEND
TITLE = MD Nastran job created on 02-Aug-12 at 21:59:02
ECHO = NONE
RESVEC = YES
$ Direct Text Input for Global Case Control Data
SUBCASE 1
TITLE=This is a default subcase.
METHOD = 1
SPC = 2
VECTOR(SORT1,REAL)=ALL
SPCFORCES(SORT1,REAL)=ALL
$ Direct Text Input for this Subcase
BEGIN BULK
PARAM POST -1
PARAM PRTMAXIM YES
EIGRL 1 40 0 MASS
$ Direct Text Input for Bulk Data
$ Elements and Element Properties for region : p1
PSOLID 1 1 0 PFLUID
$ Pset: "p1" will be imported as: "psolid.1"
CHEXA 1 1 1 2 23 22 442 443
464 463.......
$ Loads for Load Case : Default
SPCADD 2 1
$ Displacement Constraints of Load Set : b1
SPC1 1 1234561 THRU 463
SPC1 1 123456483 484 504 505 525 526.......
$ Referenced Coordinate Frames
ENDDATA dedc9171
还请高手们帮忙看看，指点一下，感激不尽
为什么不用VL算呢？一分钟的事情。用Nastran做声学的人是很少的。 {:{13}:}正打算学nastran呢
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