diff --git a/src/Diagnostics/ErrorMessages-EN-US.cpp b/src/Diagnostics/ErrorMessages-EN-US.cpp
index 14636ca..fc2b310 100644
--- a/src/Diagnostics/ErrorMessages-EN-US.cpp
+++ b/src/Diagnostics/ErrorMessages-EN-US.cpp
@@ -6,5 +6,29 @@ namespace Porygon::Diagnostics {
     const std::unordered_map<DiagnosticCode, const char*> ErrorMessages{ // NOLINT(cert-err58-cpp)
             {DiagnosticCode ::UnexpectedCharacter, "Encountered an unexpected character: '{0}'."},
             {DiagnosticCode ::InvalidStringControlCharacter, "'{0}' is not a valid control character."},
+
+            {DiagnosticCode ::UnexpectedToken, "Encountered unexpected token kind."},
+            {DiagnosticCode ::NoBinaryOperationFound, "No binary operation found for these operands and operator."},
+            {DiagnosticCode ::NoUnaryOperationFound, "No unary operation found for this operand and operator."},
+            {DiagnosticCode ::CantAssignVariable, "Something went wrong while assigning variable."},
+            {DiagnosticCode ::VariableNotFound, "Variable not found."},
+            {DiagnosticCode ::ExpressionIsNotAFunction, "Called expression is not a function."},
+            {DiagnosticCode ::CantIndex, "Unable to index value."},
+            {DiagnosticCode ::InvalidReturnType, "Invalid return type."},
+            {DiagnosticCode ::ConditionNotABool, "A condition should return a bool."},
+            {DiagnosticCode ::InvalidTableValueType, "This is an invalid table value type."},
+            {DiagnosticCode ::InvalidTypeName, "This type name is not valid."},
+            {DiagnosticCode ::UserDataFieldNoGetter, "This userdata field does not have a getter."},
+            {DiagnosticCode ::UserDataFieldNoSetter, "This userdata field does not have a setter."},
+            {DiagnosticCode ::NumericalForArgumentNotANumber, "A numerical for argument should be a number."},
+            {DiagnosticCode ::CantIterateExpression, "Can't iterate over given expression."},
+            {DiagnosticCode ::InvalidFunctionParameters, "No function option found for given parameters."},
+            {DiagnosticCode ::ModuleDoesntExist, "The requested module was not found."},
+            {DiagnosticCode ::InvalidCast, "No cast found between these two types."},
+
+            {DiagnosticCode ::DataLossOnCast, "After this cast data will be lost!"},
+
+            {DiagnosticCode ::UnvalidatedCast, "The cast between these two types could not be validated."},
+
     };
 }
\ No newline at end of file