diff --git a/tools/yulPhaser/Exceptions.h b/tools/yulPhaser/Exceptions.h
index ae75d19ef..1f675a9ef 100644
--- a/tools/yulPhaser/Exceptions.h
+++ b/tools/yulPhaser/Exceptions.h
@@ -22,6 +22,9 @@
 namespace solidity::phaser
 {
 
-struct InvalidProgram: virtual util::Exception {};
+struct BadInput: virtual util::Exception {};
+struct InvalidProgram: virtual BadInput {};
+struct NoInputFiles: virtual BadInput {};
+struct MissingFile: virtual BadInput {};
 
 }
diff --git a/tools/yulPhaser/Phaser.cpp b/tools/yulPhaser/Phaser.cpp
index 87bbb0eba..4c2aff071 100644
--- a/tools/yulPhaser/Phaser.cpp
+++ b/tools/yulPhaser/Phaser.cpp
@@ -136,7 +136,7 @@ Program ProgramFactory::build(Options const& _options)
 
 CharStream ProgramFactory::loadSource(string const& _sourcePath)
 {
-	assertThrow(boost::filesystem::exists(_sourcePath), InvalidProgram, "Source file does not exist");
+	assertThrow(boost::filesystem::exists(_sourcePath), MissingFile, "Source file does not exist: " + _sourcePath);
 
 	string sourceCode = readFileAsString(_sourcePath);
 	return CharStream(sourceCode, _sourcePath);
@@ -216,10 +216,7 @@ Phaser::CommandLineParsingResult Phaser::parseCommandLine(int _argc, char** _arg
 	}
 
 	if (arguments.count("input-file") == 0)
-	{
-		cerr << "Missing argument: input-file." << endl;
-		return {1, move(arguments)};
-	}
+		assertThrow(false, NoInputFiles, "Missing argument: input-file.");
 
 	return {0, arguments};
 }
diff --git a/tools/yulPhaser/main.cpp b/tools/yulPhaser/main.cpp
index 1cfd310b7..a567e355a 100644
--- a/tools/yulPhaser/main.cpp
+++ b/tools/yulPhaser/main.cpp
@@ -36,10 +36,10 @@ int main(int argc, char** argv)
 		std::cerr << "ERROR: " << exception.what() << std::endl;
 		return 1;
 	}
-	catch (solidity::phaser::InvalidProgram const& exception)
+	catch (solidity::phaser::BadInput const& exception)
 	{
-		// Error in the input data. One of the provided programs contains errors and could not be loaded.
-		// Handle it and exit.
+		// Bad input data. Syntax errors in the input program, semantic errors in command-line
+		// parameters, etc.
 
 		std::cerr << std::endl;
 		std::cerr << "ERROR: " << exception.what() << std::endl;