First defined here occurs during QT compilation. Causes and Solutions

scene

Today, I want to write the module I wrote before , All integrated together , As a result, this error occurs as soon as the compiler is compiled ,

reason

Because the header file contains , Then I thought about it , I write each module independently , How can it be repeated , Then I went to pro I read it in the document , Sure enough, there are two identical header file names （QT Don't deceive me ）

resolvent

Just remove one of them , Or change the name of one of the header files , It's OK not to repeat .