Crash on startup

When attempting to load the 12.61 version under Linux the following happens at the loading screen:

System.TypeLoadException: Failure has occurred while loading a type.

at SoftwareIdeasModeler.Sidebars.Symbols.SymbolListControl.UpdateContent () [0x00000] in <374ce8c01752462f909707284ddae273>:0

at (wrapper remoting-invoke-with-check) SoftwareIdeasModeler.Sidebars.Symbols.SymbolListControl:UpdateContent ()

at SoftwareIdeasModeler.Sidebars.Symbols.SymbolsSidebar.OnProjectChanged (SoftwareIdeasModeler.Sidebars.Base.ProjectChangeEventArgs e) [0x00007] in <374ce8c01752462f909707284ddae273>:0

at SoftwareIdeasModeler.Sidebars.Base.BaseSidebar.set_Project (SoftwareIdeasModeler.Core.Projecting.Project value) [0x0001b] in <374ce8c01752462f909707284ddae273>:0

at (wrapper remoting-invoke-with-check) SoftwareIdeasModeler.Sidebars.Base.BaseSidebar:set_Project (SoftwareIdeasModeler.Core.Projecting.Project)

at SoftwareIdeasModeler.MainForm.UpdateSidebars () [0x00039] in <374ce8c01752462f909707284ddae273>:0

at SoftwareIdeasModeler.MainForm.InitializeSideBars () [0x00602] in <374ce8c01752462f909707284ddae273>:0

at SoftwareIdeasModeler.MainForm.InitializeEnvironment () [0x00012] in <374ce8c01752462f909707284ddae273>:0

at SoftwareIdeasModeler.MainForm.Initialize () [0x00058] in <374ce8c01752462f909707284ddae273>:0

at SoftwareIdeasModeler.MainForm..ctor () [0x000e7] in <374ce8c01752462f909707284ddae273>:0

at (wrapper remoting-invoke-with-check) SoftwareIdeasModeler.MainForm:.ctor ()

at SoftwareIdeasModeler.AppCore.StartNewMainForm (System.Windows.Forms.Form splash) [0x00000] in <374ce8c01752462f909707284ddae273>:0

at SoftwareIdeasModeler.AppCore.RunMainWindow (System.Windows.Forms.Form splash) [0x00053] in <374ce8c01752462f909707284ddae273>:0

RunMainWindow