PluginManager Unable to load type 'Keysight.OpenTap.Wpf.TestPlanStepFinder'

How to resolve this Error :
PluginManager Unable to load type ‘Keysight.OpenTap.Wpf.TestPlanStepFinder’ from ‘D:\Desktop\BSCAN\bin\Debug\Packages\WPF Controls\Keysight.OpenTap.Wpf.dll’. Reason: ‘Could not load type ‘OpenTap.ITypeDataSourceProvider’ from assembly ‘OpenTap, Version=9.17.4.0, Culture=neutral, PublicKeyToken=null’.’.

How did you get this error to begin with?