diff --git a/main.cu b/main.cu
index d812ac7..ca232f7 100644
--- a/main.cu
+++ b/main.cu
@@ -844,7 +844,7 @@ int main(int argc, char* argv[]) {
 	
 	// add arguments
 	args.add("help", "prints the help");
-	args.add("network", "load network from .obj or .swc file");
+	//args.add("network", "load network from .obj or .swc file");
 	args.add("maxpress", "maximum allowed pressure in g / units / s^2, default 2 is for blood when units = um", "2", "real value > 0");
 	args.add("viscosity", "set the viscosity of the fluid (in g / units / s), default .00001 is for blood when units = um", ".00001", "real value > 0");
 	args.add("rou", "set the desity of the fluid (in g / units^3), default 1.06*10^-12 is for blood when units = um", ".00000000000106", "real value > 0");
@@ -860,12 +860,16 @@ int main(int argc, char* argv[]) {
 	}
 
 	// load network
-	if (args["network"].is_set()) {						// load network from user 
-		std::vector<std::string> tmp = stim::parser::split(args["network"].as_string(), '.');
+	if (args.nargs() == 0) {
+		std::cout << "Network file required." << std::endl;
+		return 1;
+	}	
+	else {						// load network from user 
+		std::vector<std::string> tmp = stim::parser::split(args.arg(0), '.');
 		if ("obj" == tmp[1])
-			flow.load_obj(args["network"].as_string());
+			flow.load_obj(args.arg(0));
 		else if ("swc" == tmp[1])
-			flow.load_swc(args["network"].as_string());
+			flow.load_swc(args.arg(0));
 		else {
 			std::cout << "Invalid file type" << std::endl;
 			std::exit(1);
--
libgit2 0.21.4