Hello there, I am walking against a small issue. Anyone know i am missing something? 
running Oxide.Rust Version: 2.0.6241 
              build: 258550

I posted the error below. 

Exception while resolving plugin references (InvalidOperationException: No process is associated with this object.)
at System.Diagnostics.Process.EnsureState (System.Diagnostics.Process+State state) [0x00018] in <e2bec1e2c81b42b3b2ee8a58b12808fc>:0
at System.Diagnostics.Process.get_Handle () [0x00000] in <e2bec1e2c81b42b3b2ee8a58b12808fc>:0
at (wrapper remoting-invoke-with-check) System.Diagnostics.Process.get_Handle() 0b/s in, 0b/s out
at Oxide.CSharp.CompilerService.Start () [0x00012] in <795304323ac74a298b8ed190a1dfa739>:0
at Oxide.CSharp.CompilerService.EnqueueCompilation (Oxide.Plugins.Compilation compilation) [0x0001f] in <795304323ac74a298b8ed190a1dfa739>:0
at Oxide.CSharp.CompilerService+<>c__DisplayClass26_0.<Compile>b__0 () [0x00000] in <795304323ac74a298b8ed190a1dfa739>:0
at Oxide.Plugins.Compilation+<>c__DisplayClass20_0.<Prepare>b__0 (System.Object _) [0x00431] in <795304323ac74a298b8ed190a1dfa739>:0
Exception while resolving plugin references (InvalidOperationException: No process is associated with this object.)
at System.Diagnostics.Process.EnsureState (System.Diagnostics.Process+State state) [0x00018] in <e2bec1e2c81b42b3b2ee8a58b12808fc>:0
at System.Diagnostics.Process.get_Handle () [0x00000] in <e2bec1e2c81b42b3b2ee8a58b12808fc>:0 28fps 129gc 1h30m14s
at (wrapper remoting-invoke-with-check) System.Diagnostics.Process.get_Handle() 0b/s in, 0b/s out
at Oxide.CSharp.CompilerService.Start () [0x00012] in <795304323ac74a298b8ed190a1dfa739>:0
at Oxide.CSharp.CompilerService.EnqueueCompilation (Oxide.Plugins.Compilation compilation) [0x0001f] in <795304323ac74a298b8ed190a1dfa739>:0
at Oxide.CSharp.CompilerService+<>c__DisplayClass26_0.<Compile>b__0 () [0x00000] in <795304323ac74a298b8ed190a1dfa739>:0
at Oxide.Plugins.Compilation+<>c__DisplayClass20_0.<Prepare>b__0 (System.Object _) [0x00431] in <795304323ac74a298b8ed190a1dfa739>:0
[CSharp] Started Oxide.Compiler v*.*.*.* successfully
[CSharp] Started Oxide.Compiler v*.*.*.* successfully
Error while compiling StructureRefund: 'ConstructionGrade' does not contain a definition for 'costToBuild' and no accessible extension method 'costToBuild' accepting a first argument of type 'ConstructionGrade' could be found (are you missing a using directive or an assembly reference?) | Line: 67, Pos: 81
Error while compiling StructureRefund: 'ConstructionGrade' does not contain a definition for 'costToBuild' and no accessible extension method 'costToBuild' accepting a first argument of type 'ConstructionGrade' could be found (are you missing a using directive or an assembly reference?) | Line: 67, Pos: 81

Thanks allready for the potential help!