用的ANSYS20，打开某个设计文件就报错提示说 Unable to open some designs from the project file. This maybe caused by insufficient licenses for the types of designs in the project, or by a corrpted project file. Saving this project wil resut in unopened designs and their data being removed from the projet. Please use Save Astoavoid overwriting and losing data from the existing files. 我现在的这个设计文件我不管是从外部还是从hfss内部都无法打开，其他的文件是无法从外部打开，但可以从程序里打开。请问大佬们怎么解决，我先前装过一个 16版本的hfss，但已经卸载了，是这个的影响吗