diff --git a/build.gradle b/build.gradle
index a85cb17..9aad2a6 100644
--- a/build.gradle
+++ b/build.gradle
@@ -6,7 +6,7 @@ apply plugin: 'jacoco'
 apply plugin: "com.madvay.tools.build.gitbuildinfo"
 
 buildscript {
-    ext.kotlin_version = '1.0.5-2'
+    ext.kotlin_version = '1.0.6'
 
     repositories {
         jcenter()
@@ -20,10 +20,8 @@ buildscript {
     }
 }
 
-sourceCompatibility = 1.7
 group = "com.github.sybila.ctl"
-archivesBaseName = "ctl-parser"
-version = '2.2.0'
+version = '2.2.3'
 
 //antlr config
 generateGrammarSource {
@@ -91,4 +89,5 @@ test {
     testLogging {
         events "skipped", "failed", "standardOut", "standardError"
     }
+    void
 }
\ No newline at end of file
diff --git a/src/main/kotlin/com/github/sybila/huctl/HUCTLParser.kt b/src/main/kotlin/com/github/sybila/huctl/HUCTLParser.kt
index a5f8f83..702f23c 100644
--- a/src/main/kotlin/com/github/sybila/huctl/HUCTLParser.kt
+++ b/src/main/kotlin/com/github/sybila/huctl/HUCTLParser.kt
@@ -23,21 +23,21 @@ import java.util.*
  * and returns a final map of valid formula assignments
  */
 
-class HUCTLParser() {
+class HUCTLParser {
 
     fun formula(input: String): Formula = parse("val = $input")["val"]!!
 
     fun dirFormula(input: String): DirectionFormula
             = (formula("{$input}EX True") as? Formula.Simple<*>)?.direction
-            ?: throw IllegalStateException("$input is not a direction formula")
+            ?: throw IllegalArgumentException("$input is not a direction formula")
 
     fun atom(input: String): Formula.Atom
             = formula(input) as? Formula.Atom
-            ?: throw IllegalStateException("$input is not an atom")
+            ?: throw IllegalArgumentException("$input is not an atom")
 
     fun dirAtom(input: String): DirectionFormula.Atom
             = dirFormula(input) as? DirectionFormula.Atom
-            ?: throw IllegalStateException("$input is not a direction atom")
+            ?: throw IllegalArgumentException("$input is not a direction atom")
 
     fun parse(input: String, onlyFlagged: Boolean = false): Map<String, Formula>
             = process(FileParser().process(input), onlyFlagged)
@@ -228,7 +228,7 @@ private class FileParser {
         lexer.removeErrorListeners()
         lexer.addErrorListener(errorListener)
         parser.removeErrorListeners()
-        lexer.addErrorListener(errorListener)
+        parser.addErrorListener(errorListener)
         val root = parser.root()
         val context = FileContext(location)
         ParseTreeWalker().walk(context, root)
@@ -260,7 +260,7 @@ private data class ParserContext(
                 .map { one -> assignments.filter { two -> one.name == two.name }.toSet().toList() }
                 .filter { it.size > 1 }
                 .any {
-                    throw IllegalStateException(
+                    throw IllegalArgumentException(
                             "Duplicate assignment for ${it[0].name} defined in ${it[0].location} and ${it[1].location}"
                     )
                 }
@@ -306,7 +306,7 @@ private class FileContext(val location: String) : HUCTLBaseListener() {
     }
 
     override fun visitErrorNode(node: ErrorNode) {
-        throw IllegalStateException("Syntax error at '${node.text}' in $location:${node.symbol.line}")
+        throw IllegalArgumentException("Syntax error at '${node.text}' in $location:${node.symbol.line}")
     }
 
     /* ------ Formula Parsing ------ */
diff --git a/src/test/kotlin/com/github/sybila/huctl/ParserBasicTest.kt b/src/test/kotlin/com/github/sybila/huctl/ParserBasicTest.kt
index 374768d..c900701 100644
--- a/src/test/kotlin/com/github/sybila/huctl/ParserBasicTest.kt
+++ b/src/test/kotlin/com/github/sybila/huctl/ParserBasicTest.kt
@@ -411,7 +411,7 @@ class Basic {
 
     @Test
     fun dirFormulaInvalidParse() {
-        assertFailsWith<IllegalStateException> {
+        assertFailsWith<IllegalArgumentException> {
             parser.dirFormula("True && EX False")
         }
     }
@@ -425,7 +425,7 @@ class Basic {
 
     @Test
     fun atomInvalidParse() {
-        assertFailsWith<IllegalStateException> {
+        assertFailsWith<IllegalArgumentException> {
             parser.atom("EX x > 2.2")
         }
     }
@@ -438,9 +438,17 @@ class Basic {
 
     @Test
     fun dirAtomInvalidParse() {
-        assertFailsWith<IllegalStateException> {
+        assertFailsWith<IllegalArgumentException> {
             parser.dirAtom("x+ && y-")
         }
     }
 
+
+    @Test
+    fun garbageParse() {
+        assertFailsWith<IllegalArgumentException> {
+            parser.parse(" foo ")
+        }
+    }
+
 }
\ No newline at end of file
diff --git a/src/test/kotlin/com/github/sybila/huctl/ParserReferencesTest.kt b/src/test/kotlin/com/github/sybila/huctl/ParserReferencesTest.kt
index 99033ae..99ec78f 100644
--- a/src/test/kotlin/com/github/sybila/huctl/ParserReferencesTest.kt
+++ b/src/test/kotlin/com/github/sybila/huctl/ParserReferencesTest.kt
@@ -93,7 +93,7 @@ class References {
             it.write("k = True")
         }
 
-        assertFailsWith(IllegalStateException::class) {
+        assertFailsWith(IllegalArgumentException::class) {
             parser.parse(
                     ":include \"${ i1.absolutePath }\" \n" +
                     "k = False"
@@ -105,7 +105,7 @@ class References {
 
     @Test
     fun duplicateDeclarationInString() {
-        assertFailsWith(IllegalStateException::class) {
+        assertFailsWith(IllegalArgumentException::class) {
             parser.parse("""
                 k = True
                 l = False
@@ -116,7 +116,7 @@ class References {
 
     @Test
     fun duplicateDeclarationExpression() {
-        assertFailsWith(IllegalStateException::class) {
+        assertFailsWith(IllegalArgumentException::class) {
             parser.parse("""
                 k = 1
                 l = 2