在hyppermesh自带的求解器optistruct中求解出现的错误，以下是什么意思，怎么改望高手指点
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*** ERROR # 1000 in the input data:
Incorrect data in field # 4.
Detected while reading line 83575 from file E:/jueshaxianxi/11.fem:
"PWELD 1 1"
This line was interpreted as:
83575:PWELD, 1, 1
Expected REAL > 0, found BLANK.
Syntax error(s) found in bulk data 'PWELD' card.
*** ERROR # 1000 in the input data:
Incorrect data in field # 4.
Detected while reading line 83579 from file E:/jueshaxianxi/11.fem:
"PWELD 2 1"
This line was interpreted as:
83579:PWELD, 2, 1
Expected REAL > 0, found BLANK.
Syntax error(s) found in bulk data 'PWELD' card.
Incorrect data in field # 4.
Detected while reading line 83575 from file E:/jueshaxianxi/11.fem:
"PWELD 1 1"
This line was interpreted as:
83575:PWELD, 1, 1
Expected REAL > 0, found BLANK.
Syntax error(s) found in bulk data 'PWELD' card.
*** ERROR # 1000 in the input data:
Incorrect data in field # 4.
Detected while reading line 83579 from file E:/jueshaxianxi/11.fem:
"PWELD 2 1"
This line was interpreted as:
83579:PWELD, 2, 1
Expected REAL > 0, found BLANK.
Syntax error(s) found in bulk data 'PWELD' card.
TechmanLXS 
