.meas exp() function syntax w/ complex argument

text with math operators will be auto format by forum (e.g. remove * from formula). review this post how to post text with math operators
Qspice Forum - New User to Basic User (File Upload) - QSPICE - Qorvo Tech Forum

as you are basic user, you can upload .qsch file. consider to upload your .qsch as it is harder to understand your question with only your measurement formula.