Issue in using Set Integer(by ref) function in a blueprint in Unreal Engine

I am trying to set the value of an integer by reference in a macro created in my blueprint script. The macro does a simple conditional check of an integer and increments it if it is less than a max value. I was using one of the maze generating tutorials and the function throws a failed to resolve term Value passed into Target error. I am not sure why it cannot deduce the type of Value. The original tutorial was made in UE 4.6, so could it be due to updates made in UE 4.16? I have attached a screenshot of my blueprint. [not sure if this section might be the correct one since I couldn't find an appropriate section to post this question].