ArcObjects Error HRESULT E_FAIL has been returned from a call to a COM component

Question

When you run a Python script from ArcObject .net, an error occurs, all parameters are correct. ArcMap 10.6

import arcpy
from arcpy import env
arcpy.env.overwriteOutput = True
env.workspace = arcpy.GetParameterAsText(0)
#"D:\GISLAB3\Post.mdb"
#Result = arcpy.GetParameterAsText(1)
Result = arcpy.GetParameterAsText(1)
#"D:\GISLAB3"
Hous = arcpy.GetParameterAsText(2)
#"Postt" 
arcpy.FeatureClassToShapefile_conversion(Hous, Result)
c#
 private void button1_Click(object sender, EventArgs e)
 {
 IGeoProcessor2 gp = new GeoProcessorClass();
 gp.AddToolbox("D:/GISLAB3/Scripts.tbx");
 IVariantArray parameters = new VarArrayClass();
 parameters.Add("D:/GISLAB3/Post.mdb");
 parameters.Add("D:/GISLAB3");
 parameters.Add("New");
 gp.Execute("lol", parameters, null);
 }

enter image description here

Answer 1

Wrap your call to Geoprocess.Execute in a try catch and get the output messages. It will likely give you a more useful error:

try
{
 _gp.Execute(process, null);
}
catch (Exception e)
{
 StringBuilder messages = new StringBuilder("Error running " + process.ToolName + "\r\n");
 for (int i = 0; i < _gp.MessageCount; i++)
 messages.AppendLine(_gp.GetMessage(i));
 throw new Exception(messages.ToString());
}