为什么总是提示物质未定义呢？是什么原因？怎么解决？希望得到好心人的帮助

wangqq3033

STRUCTURE FOR COMPONENT O2 HAS NOT BEEN DEFINED.
       PCES CANNOT USE GROUP-CONTRIBUTION METHODS TO ESTIMATE MISSING PROPERTIES
       USE THE STRUCTURES PARAGRAPH TO DEFINE STRUCTURES OF THIS COMPONENT.
       STRUCTURE FOR COMPONENT CO2 HAS NOT BEEN DEFINED.
       PCES CANNOT USE GROUP-CONTRIBUTION METHODS TO ESTIMATE MISSING PROPERTIES
       USE THE STRUCTURES PARAGRAPH TO DEFINE STRUCTURES OF THIS COMPONENT.
       STRUCTURE FOR COMPONENT N2 HAS NOT BEEN DEFINED.
       PCES CANNOT USE GROUP-CONTRIBUTION METHODS TO ESTIMATE MISSING PROPERTIES
       USE THE STRUCTURES PARAGRAPH TO DEFINE STRUCTURES OF THIS COMPONENT.
       STRUCTURE FOR COMPONENT SO2:G HAS NOT BEEN DEFINED.
       PCES CANNOT USE GROUP-CONTRIBUTION METHODS TO ESTIMATE MISSING PROPERTIES
       USE THE STRUCTURES PARAGRAPH TO DEFINE STRUCTURES OF THIS COMPONENT.
       STRUCTURE FOR COMPONENT SO2:AQ HAS NOT BEEN DEFINED.