C1816: Unknown struct- or union-member

[ERROR]

Description

A nonmember of a structure or union was incorrectly used.

Example
  struct A {

  
    int i;

  
  } a;

  
  void main(void) {

  
    a.I=2;

  
  }

  
Tips

On the right side of the ì->ì or . operator, there must be a member of the structure/union specified on the left side. C is case sensitive.