diff --git a/src/call.py b/src/call.py
index 0ae3d38c251f30f93bc20a21440c8b181a7fc7af..8c0f5767a4cb20650580ecc33d395d3893415374 100644
--- a/src/call.py
+++ b/src/call.py
@@ -54,7 +54,7 @@ class Call(Executor):
             if(para.get_type()=="Call"):
                 tab = para.get_elements_called(tab_input = tab.copy(), first_call = False)
             elif(para.get_type()=="Operation"):
-                tab += para.get_elements_called(tab = tab.copy())
+                tab = para.get_elements_called(tab = tab.copy())
 
         temp = list(set(tab))
         #del tab
diff --git a/src/workflow.py b/src/workflow.py
index f458b400e4446f4ddbd59e63a77af514c31fe3eb..6815b28250f201625ee1c95d73f6d3a03acfc96e 100644
--- a/src/workflow.py
+++ b/src/workflow.py
@@ -19,7 +19,7 @@ class Workflow:
                  license = None, creativeWorkStatus = None, authors = None, 
                  version = None, keywords = None, producer = None,
                  publisher = None, processes_2_remove = None):
-        print("here")
+
         if(not os.path.isfile(file)):
             nextflow_files = glob.glob(f'{file}/*.nf')
             if(len(nextflow_files)==0):