there were 48 error messages during input processing. the first message is repeated below: ***ERROR#1237*** CELAS1 element number 5904563 references a missing or invalid property number11. (这48个错误就是我定义了48个弹簧,number11的属性就是我定义的弹簧属性。我在RADIOSS下的弹簧TYPE是pelas,结果全都不可用),怎么办呢