Semantic Error: A function block instance, function or method with the name '...' does not exist.
In an ST code worksheet, an unknown function block, function or method is called. The called object is neither defined in the current project nor contained in an included library.
Create a suitable POU in the folder 'COMPONENTS | Programming > Local > 'Functions & Function Blocks' or any subfolder or include a firmware or user library which provides the object (by right-clicking the 'Libraries' folder).