diff --git a/src/SVM.Assembler.Core/Assembler.cs b/src/SVM.Assembler.Core/Assembler.cs
index 6315046..4743e89 100644
--- a/src/SVM.Assembler.Core/Assembler.cs
+++ b/src/SVM.Assembler.Core/Assembler.cs
@@ -1,5 +1,6 @@
 using LibCLCC.NET.Lexer;
 using LibCLCC.NET.Operations;
+using SVM.Assembler.Core.Errors;
 using SVM.Core;
 using System;
 using System.Collections.Generic;
@@ -13,9 +14,9 @@ namespace SVM.Assembler.Core
 @"
 Match:
 
-D \d
-Number {D}+
 InstMath bmath
+InstSDInt32 sd\.int32
+InstSDInt sd\.int
 InstCvt cvt
 InstSystem system
 InstSys sys
@@ -24,15 +25,19 @@ Register \${D}+
 LabelCode \.code\:
 LabelData \.data\:
 LabelConst \.const\:
-word [\w\d]+
+word [\w\d\.]+
 GenericLabel {word}\:
 LineEnd \n
 string ""\"".*\""""
+Number \d+
+D \d
 
 
 Id:
 word Word
 InstMath inst
+InstSDInt inst
+InstSDInt32 inst
 InstCvt inst
 InstSystem inst
 InstSys inst
@@ -75,6 +80,7 @@ LabelConstant InternalLbl
 				if (r.Result.LexSegmentId != null && r.Result.LexMatchedItemId != null)
 				{
 					if (r.Result.LexSegmentId == "LE") continue;
+					
 					return r;
 				}
 
@@ -119,7 +125,7 @@ LabelConstant InternalLbl
 			}
 			if (!ISA.InstructionDefinitionAliases.TryGetValue(LexDef.Content ?? "", out var instructionDef))
 			{
-				operationResult.AddError(new Error());
+				operationResult.AddError(new ErrorWMsg($"Unknown Instruction:{LexDef.Content ?? "<null>"}", LexDef));
 				return operationResult;
 			}
 			intermediateInstruction.inst = instructionDef.PrimaryInstruction;
@@ -140,6 +146,7 @@ LabelConstant InternalLbl
 				}
 				if (!item.AllowedTokenIds.Contains(next.Result.LexSegmentId))
 				{
+					operationResult.AddError(new ErrorWMsg($"Token: {LexDef.Content ?? "<null>"} is not allowed here.", LexDef));
 					return operationResult;
 				}
 				intermediateInstruction.Parameters.Add(next.Result);
diff --git a/src/SVM.Assembler.Core/Errors/ErrorWMsg.cs b/src/SVM.Assembler.Core/Errors/ErrorWMsg.cs
new file mode 100644
index 0000000..56d73ee
--- /dev/null
+++ b/src/SVM.Assembler.Core/Errors/ErrorWMsg.cs
@@ -0,0 +1,27 @@
+using LibCLCC.NET.Lexer;
+using LibCLCC.NET.Operations;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace SVM.Assembler.Core.Errors
+{
+	public class ErrorWMsg : Error
+	{
+		public String Message;
+		public LexSegment? Pos;
+		public ErrorWMsg(string message, LexSegment? pos = null)
+		{
+			Message = message;
+			Pos = pos;
+		}
+
+		public override string ToString()
+		{
+			if (Pos == null)
+				return Message;
+			else
+				return Message + $" At: {Pos.SourceID}:{Pos.Position}";
+		}
+	}
+}
diff --git a/src/SVM.Assembler.Core/Linker.cs b/src/SVM.Assembler.Core/Linker.cs
index b9e1ffc..d9a149e 100644
--- a/src/SVM.Assembler.Core/Linker.cs
+++ b/src/SVM.Assembler.Core/Linker.cs
@@ -1,9 +1,11 @@
 using LibCLCC.NET.Operations;
 using Microsoft.Win32.SafeHandles;
+using SVM.Assembler.Core.Errors;
 using SVM.Core;
 using SVM.Core.Utils;
 using System;
 using System.Collections.Generic;
+using System.ComponentModel;
 using System.Reflection.Emit;
 using System.Text;
 
@@ -262,6 +264,7 @@ namespace SVM.Assembler.Core
 		public unsafe static OperationResult<bool> translate(InstructionDefinition def, LinkingContext context, IntermediateInstruction iinstruction, SVMInstruction* instruction)
 		{
 			OperationResult<bool> result = new OperationResult<bool>(false);
+			((IntPtr)instruction).SetData((byte)def.PrimaryInstruction);
 			//SVMInstruction instruction = new SVMInstruction();
 			for (int i = 0; i < iinstruction.Parameters.Count; i++)
 			{
@@ -270,6 +273,7 @@ namespace SVM.Assembler.Core
 				string converter = paraDef.ExpectdValue.Converter;
 				if (para.Content == null)
 				{
+					result.AddError(new ErrorWMsg($"{para.Content} (Parameter {i}) have no content!", para));
 					return result;
 				}
 				if (converter.StartsWith("InternalEnum:"))
@@ -291,6 +295,7 @@ namespace SVM.Assembler.Core
 							{
 								if (!TryParseRegister(para.Content, context, out var registerID))
 								{
+									result.AddError(new ErrorWMsg($"{para.Content} cannot be parsed to Register!", para));
 									return result;
 								}
 								WriteData(instruction, paraDef.ExpectdValue.Type, paraDef.ExpectdValue.Pos, &registerID);
@@ -300,6 +305,7 @@ namespace SVM.Assembler.Core
 							{
 								if (!TryParseInt32(para.Content, context, out var registerID))
 								{
+									result.AddError(new ErrorWMsg($"{para.Content} cannot be parsed to Integer32!", para));
 									return result;
 								}
 								WriteData(instruction, paraDef.ExpectdValue.Type, paraDef.ExpectdValue.Pos, (byte*)&registerID);
diff --git a/src/SVM.Assembler/ISA.xml b/src/SVM.Assembler/ISA.xml
index 54f492e..ecc099d 100644
--- a/src/SVM.Assembler/ISA.xml
+++ b/src/SVM.Assembler/ISA.xml
@@ -60,8 +60,16 @@
 				<InstructionParameter>
 					<MatchingItems>
 						<Item Id="Word"/>
+						<Item Id="Register"/>
 					</MatchingItems>
-					<ExpectedValue Type="Int32" Pos="8" Converter="Ingeter32" />
+					<ExpectedValue Type="UInt8" Pos="1" Converter="Register" />
+				</InstructionParameter>
+				<InstructionParameter>
+					<MatchingItems>
+						<Item Id="Number"/>
+						<Item Id="Word"/>
+					</MatchingItems>
+					<ExpectedValue Type="Int32" Pos="8" Converter="Integer32" />
 				</InstructionParameter>
 			</Parameters>
 		</InstructionDefinition>
diff --git a/src/SVM.Assembler/Program.cs b/src/SVM.Assembler/Program.cs
index 2604f8d..e8efebd 100644
--- a/src/SVM.Assembler/Program.cs
+++ b/src/SVM.Assembler/Program.cs
@@ -40,12 +40,20 @@ namespace SVM.Assembler
 						break;
 				}
 			}
+			if (files.Count == 0)
+			{
+				return;
+			}
 			Assembler.Core.Assembler assembler = new Core.Assembler(def);
 			foreach (var item in files)
 			{
 				var result = assembler.AssembleIntermediateObject(File.ReadAllText(item), item);
 				if (result.HasError())
 				{
+					foreach (var error in result.Errors)
+					{
+						Console.Error.WriteLine(error.ToString());
+					}
 					Console.Error.WriteLine($"Error at assembling {item}. Abort.");
 					return;
 				}