"The size is too large to communicate."
The size of the screen data to transfer may have exceeded the capacity available with the V series.
Select [Tool] -> [List of Memory Use] on the V-SFT-6 editor and check the screen data size.

If the capacity is exceeded, make the screen data size smaller.
For example, store message and pattern data on a storage device to reduce the screen data size.
[Setting location]
V-SFT-6 editor [System Setting] -> [Other] -> [Storage Setting]