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Steps to reproduce:
1. Open XS.
2. Click XamarinStudio->Preference
3. Select External Tool.
4. Add External Tool and click OK button.
Actual Result: After adding external tool it is throwing exception "System.Reflection.TargetInvocationException". However, when user change title of added external tool and click on OK button, It shows a popup showing 'The command of Tool .. is invalid'.
Expected Result: User should able to add external tool.
Error details: https://gist.github.com/saurabh360/24d7bd6e0545b471da6a
XS 4.1.10(build 6)
We are seeing same behavior with Stable XS 4.0.12 and Stable XS 4.0.8(build 2) We are not sure it has ever worked or not.
Well, in the second try, you had no command written, so it would be an empty command. I shall take care of this.
Fixed and will be included in next releases.
The issues you were hitting on were mostly related to the Command section being blank. You cannot add a tool without a command.
Today I have checked this issue with following builds:
X.S 4.0.13(build 37)
And we have observed that If we add and external tool and then provide and text in Command Text box and click on OK button the External tool get added successfully. However, If we change the title and provide text in command Text box then also Title gets changed and external tool get added successfully.
Changing the status to Verified.
*** Bug 14717 has been marked as a duplicate of this bug. ***