CIL Compiler Error (CILC3020): The internal memory of the compiler is exceeded

The CIL compiler detected that its app memory (program memory + data memory) is exceeded as the generated image will be bigger than the maximum allowed value.

Remedy:

Restructure the project by minimizing the number of POUs.
Create reusable function blocks POUs for repeated parts.
Optimize the project by reducing the graphical code elements.
Avoid redundant code and program as effectively as possible.