（求助）grads报错 xxx not a variable or function name

zqq

利用nc数据文件画气候场的整层水汽通量散度积分图，脚本参考自此贴中的方法2：http://bbs.06climate.com/forum.php?mod=viewthread&tid=46015


gs文件：
*flying_nuist
'reinit'
'sdfopen D:\ecfiles\shum-qh.nc'
'sdfopen D:\ecfiles\uvrh39a.nc'
'sdfopen D:\ecfiles\sp39a.nc'
'set mpdset mres cnriver'
****************East area**************************
'set lon 40 120'
'set lat 10 50'
'set lev 1000 925 850 700 600 500 300'
'set z 1 8'
'define uave=ave(u.2*shum.1/9.8,t=1,t=117)'
'define vave=ave(v.2*shum.1/9.8,t=1,t=117)'
'set z 1'
'define ps=ave(0.01*sp.3,t=1,t=117)'
'define uvin=vint(ps,uave,300)'
'define vvin=vint(ps,vave,300)'
'define shdiv=hdivg(uvin,vvin)'

'set grads off';'set grid off';'set map 1 1 3'
'set parea 0.7 10.5 0.8 8'
'set lon 40 120'
'set lat 10 50'
'set xlopts 1 4 0.20';'set ylopts 1 4 0.20';
'set xlint 10';'set ylint 10 '
'set grads off'

'set gxout contour'
'set ccols 1'
'set cint 2e-6'
'set csmooth on'
*'set clab off'
'd shdiv'

'printim d:\gradswork\shuiqimore.png x1000 y800 white'
;




报错：
Data Request Error: Invalid grid coordinates
  World coordinates convert to non-integer  grid coordinates
    Variable = v.2  Dimension = 2
Operation Error:  Error from ave function
  Error ocurred at column 1
DEFINE error:  Invalid expression.
Data Request Warning:  Request is completely outside file limits
……
Data Request Warning:  Request is completely outside file limits
Syntax Error:  Invalid Operand
  'uave' not a variable or function name
Operation Error:  Error from vint function
  Error ocurred at column 1
DEFINE error:  Invalid expression.
Syntax Error:  Invalid Operand
  'vave' not a variable or function name
Operation Error:  Error from vint function
  Error ocurred at column 1
DEFINE error:  Invalid expression.
Syntax Error:  Invalid Operand
  'uvin' not a variable or function name
Operation Error:  Error from hdivg function
  Error ocurred at column 1
DEFINE error:  Invalid expression.
Syntax Error:  Invalid Operand
  'shdiv' not a variable or function name
  Error ocurred at column 1
DISPLAY error:  Invalid expression
  Expression = shdiv


问了同学和师兄都没能解决，有人说有时候grads就是会突然不识别，是这样吗？
求助各位大神！万分感激！