<div>
Have you checked that your reference is OK?
</div>


<div>
try late-binding.
<pre><code class="code-1 nolinks" id="code-20-42053967-1"><span>Dim appOutlook  As Object</span>
<span>Dim MailOutlook  As Object</span>
</code></pre>
 Object variables also need to be released at the end
<pre><code class="code-1 nolinks" id="code-20-42053967-2"><span>   Set appOutlook = Nothing</span>
<span>   Set MailOutlook = Nothing</span>
</code></pre>
with late-biding, you will need to use 0 (zero) instead of olMailItem
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<div>
The reference i have checked is [ Microsoft Outlook 15.0 Object Library] ;<br />
<br />
The issue to notice here is that I run this email procedure monthly; and up to last month it was working fine.<br />
Now, I am using same code, same PC , same Office version, and suddenly this error appeared.<br />
<a href="https://filedb.experts-exchange.com/incoming/2017/03_w11/1151486/UU.png" target="_blank" class="file-inline" title="UU.png (12 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>UU.png</a>
</div>


UU.png

<div>
glad you got it ~ happy to help
</div>


<div>
My comment worked because it was like a trick ., <br />
I don't understand how it worked, it just worked and resolved my problem.
</div>


<div>
<div class="content wysiwyg-content">
I need to put VBA code in MS ACCESS file to send emails, <br />
I used the date type outlook.applicatoin,<br />
<br />
I get error message : [that user-defined type NOT defined]<br />
So I go Tools&gt;References and click checkbox &quot;Microsoft Outlook 15.0 Object Library&quot;<br />
<br />
Now the error message says : Error in Loading DLL &nbsp;<br />
<br />
It appears at this line of code :<br />
<br />
&nbsp; &nbsp; &nbsp; &nbsp; Set MailOutLook = appOutLook.CreateItem(olMa<wbr />ilItem)<br />
<a href="https://filedb.experts-exchange.com/incoming/2017/03_w11/1151452/UU.png" target="_blank" class="file-inline" title="UU.png (59 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>UU.png</a>
</div>
</div>


I need to put VBA code in MS ACCESS file to send emails, 
I used the date type outlook.applicatoin,

I get error message : [that user-defined type NOT defined]
So I go Tools>References and click checkbox "Microsoft Outlook 15.0 Object Library"

Now the error message says : Error in Loading DLL  

It appears at this line of code :

        Set MailOutLook = appOutLook.CreateItem(olMailItem)

MS ACCESS file show error [Error in Loading DLL] in VBA code that sends email via outlook

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.

Outlook

Visual Basic for Applications (VBA) enables building user-defined functions (UDFs), automating processes and accessing Windows API and other low-level functionality through dynamic-link libraries (DLLs). VBA is closely related to Visual Basic and uses the Visual Basic Runtime Library, but it can normally only run code within a host application rather than as a standalone program. It can, however, be used to control one application from another via OLE Automation. VBA is built into most Microsoft Office applications.

Microsoft Access is a rapid application development (RAD) relational database tool. Access can be used for both desktop and web-based applications, and uses VBA (Visual Basic for Applications) as its coding language.