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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(265.6, 26%, 35%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ES%3C/text%3E%3C/svg%3E)
It's worked for me. Thank you for your recommend. Please repair your Excel Software. Good lucks.
Unable to cast COM object of type 'Microsoft.Office.Interop.Excel.ApplicationClass'
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(0, 91%, 10%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EVR%3C/text%3E%3C/svg%3E)
Venkata Ramana Nori
36
Reputation points
Hi
I've this C# application which opens excel file and updated another excel file. The application developed in Visual studio 2005 and Office 2016.
I've recently uninstalled Office 2016 and installed Office 365. Since then " Unable to cast COM object of type 'Microsoft.Office.Interop.Excel.ApplicationClass' " an error is generated (Image attached)
I've searched web but didn't get any idea on how to solve this error???
Developer technologies | C#
{count} votes
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(297.6, 13%, 38%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EGA%3C/text%3E%3C/svg%3E)
Girish Aghera 1 Reputation point2021-07-03T13:47:31.86+00:00 hi
did you get any solution of this issue? -
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(307.2, 4%, 39%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMM%3C/text%3E%3C/svg%3E)
Myers, Mark 35 Reputation points2023-08-28T15:20:39.4533333+00:00 The repair that is being recommended worked for me also. Open your Control Panel (Start Button on Desktop, then click the Settings gear icon), the select the Apps category and scroll down until you see 'Microsoft 365 Apps'. Click once on Microsoft 365 Apps and then select "Modify". I recommend a "Online Repair"
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(262.40000000000003, 70%, 35%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EJ%3C/text%3E%3C/svg%3E)
Joerg 0 Reputation points2023-09-28T12:05:36.89+00:00 Had the same issue, even the "Quick Repair" instead of the "Online Repair" worked for me.
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(144, 56.00000000000001%, 23%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMR%3C/text%3E%3C/svg%3E)
Mauro Rodriguez 0 Reputation points2025-01-16T18:24:06.1566667+00:00 I just did the "Quick Repair" and it worked for two programs that used visual studio.
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(128, 8%, 22%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EA%3C/text%3E%3C/svg%3E)
Anonymous2024-07-25T15:20:07.0166667+00:00 Has anyone else had this problem and the Office repair did not work. We have tried this and it works for a few days maybe weeks and then not anymore.