Form designer error with RBS 1.21.0

[mumfie]

This issue was overcome by removing the project reference to NetTopologySuite and using a SQL stored procedure to calculate location and distance.
It is however likely the original issue was related to the forum post

RADZEN Preprocessor

Thank you for the reproduction! We have fixed the issue and will release a new update shortly. The problem was caused by the order of the projects in the solution.