https://forums.autodesk.com/t5/flexsim-forum/an-invalid-task-has-been-encountered-involved-is-null/m-p/13598273#M92540 <DIV class="fr-view clearfix"> <P>The issue seems to be there is no station selected to unload to:</P> <P><span class="lia-inline-image-display-wrapper" image-alt="1689794822869.png"><img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1518381i8E6B4FBB68BD0462/image-size/large?v=v2&amp;px=999" role="button" title="1689794822869.png" alt="1689794822869.png" /></span></P> <P>If you choose a place that should fix it</P> </DIV> Wed, 19 Jul 2023 19:27:36 GMT julie_weller 2023-07-19T19:27:36Z https://forums.autodesk.com/t5/flexsim-forum/an-invalid-task-has-been-encountered-involved-is-null/m-p/13598271#M92538 <P><I>[ FlexSim 22.1.4 ]</I></P><DIV class="fr-view clearfix"> <P>How do I take corrective action?</P> <P><span class="lia-inline-image-display-wrapper" image-alt="1689794027239.png"><img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1518387i1FB1462665AEA937/image-size/large?v=v2&amp;px=999" role="button" title="1689794027239.png" alt="1689794027239.png" /></span><BR /></P> </DIV> Wed, 19 Jul 2023 19:14:57 GMT https://forums.autodesk.com/t5/flexsim-forum/an-invalid-task-has-been-encountered-involved-is-null/m-p/13598271#M92538 Sawanya_khomsan 2023-07-19T19:14:57Z https://forums.autodesk.com/t5/flexsim-forum/an-invalid-task-has-been-encountered-involved-is-null/m-p/13598272#M92539 <DIV class="fr-view clearfix"> Hi <A rel="user" href="https://answers.flexsim.com/users/43039/sawanyakhomsan.html" nodeid="43039">@sawanya khomsan</A>! That's usually due to a missing or incorrect name in the process flow for your unload task sequence. It's really tricky to say definitively what went wrong without seeing your model. If it's proprietary you can toggle this question to private so only the FlexSim support team can see it. </DIV> Wed, 19 Jul 2023 19:20:48 GMT https://forums.autodesk.com/t5/flexsim-forum/an-invalid-task-has-been-encountered-involved-is-null/m-p/13598272#M92539 julie_weller 2023-07-19T19:20:48Z https://forums.autodesk.com/t5/flexsim-forum/an-invalid-task-has-been-encountered-involved-is-null/m-p/13598273#M92540 <DIV class="fr-view clearfix"> <P>The issue seems to be there is no station selected to unload to:</P> <P><span class="lia-inline-image-display-wrapper" image-alt="1689794822869.png"><img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1518381i8E6B4FBB68BD0462/image-size/large?v=v2&amp;px=999" role="button" title="1689794822869.png" alt="1689794822869.png" /></span></P> <P>If you choose a place that should fix it</P> </DIV> Wed, 19 Jul 2023 19:27:36 GMT https://forums.autodesk.com/t5/flexsim-forum/an-invalid-task-has-been-encountered-involved-is-null/m-p/13598273#M92540 julie_weller 2023-07-19T19:27:36Z https://forums.autodesk.com/t5/flexsim-forum/an-invalid-task-has-been-encountered-involved-is-null/m-p/13598274#M92541 <DIV class="fr-view clearfix"> <P>I fixed it but got a new problem.<span class="lia-inline-image-display-wrapper" image-alt="1689795405794.png"><img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1518382iCFF1957B388E4B35/image-size/large?v=v2&amp;px=999" role="button" title="1689795405794.png" alt="1689795405794.png" /></span></P> </DIV> Wed, 19 Jul 2023 19:37:42 GMT https://forums.autodesk.com/t5/flexsim-forum/an-invalid-task-has-been-encountered-involved-is-null/m-p/13598274#M92541 Sawanya_khomsan 2023-07-19T19:37:42Z https://forums.autodesk.com/t5/flexsim-forum/an-invalid-task-has-been-encountered-involved-is-null/m-p/13598275#M92542 <DIV class="fr-view clearfix"> I think on that one you left the load station as Item Container right? The issue might be that you need to choose an actual station to load from... </DIV> Wed, 19 Jul 2023 19:45:40 GMT https://forums.autodesk.com/t5/flexsim-forum/an-invalid-task-has-been-encountered-involved-is-null/m-p/13598275#M92542 julie_weller 2023-07-19T19:45:40Z https://forums.autodesk.com/t5/flexsim-forum/an-invalid-task-has-been-encountered-involved-is-null/m-p/13598276#M92543 <DIV class="fr-view clearfix"> If that doesn't help will you post your model again? </DIV> Wed, 19 Jul 2023 19:47:21 GMT https://forums.autodesk.com/t5/flexsim-forum/an-invalid-task-has-been-encountered-involved-is-null/m-p/13598276#M92543 julie_weller 2023-07-19T19:47:21Z https://forums.autodesk.com/t5/flexsim-forum/an-invalid-task-has-been-encountered-involved-is-null/m-p/13598277#M92544 <DIV class="fr-view clearfix"> <P><A rel="noopener noreferrer" href="https://answers.flexsim.com/storage/attachments/71262-input-model-1-2.fsm" target="_blank">Input model 1_2.fsm</A></P> </DIV> Wed, 19 Jul 2023 19:49:32 GMT https://forums.autodesk.com/t5/flexsim-forum/an-invalid-task-has-been-encountered-involved-is-null/m-p/13598277#M92544 Sawanya_khomsan 2023-07-19T19:49:32Z https://forums.autodesk.com/t5/flexsim-forum/an-invalid-task-has-been-encountered-involved-is-null/m-p/13598278#M92545 <DIV class="fr-view clearfix"> <P>my latest model</P> </DIV> Wed, 19 Jul 2023 20:12:50 GMT https://forums.autodesk.com/t5/flexsim-forum/an-invalid-task-has-been-encountered-involved-is-null/m-p/13598278#M92545 Sawanya_khomsan 2023-07-19T20:12:50Z https://forums.autodesk.com/t5/flexsim-forum/an-invalid-task-has-been-encountered-involved-is-null/m-p/13598279#M92546 <DIV class="fr-view clearfix"><P>The problem is that you created all the tasks sequences to transfer the items on the CB transporter, but some of them are taken out by Transporter2 (and destroyed) so the task sequence is invalid when the CB comes to move the item.</P><P>It's not good model hygiene to mix methods like this.</P></DIV> Thu, 20 Jul 2023 15:38:03 GMT https://forums.autodesk.com/t5/flexsim-forum/an-invalid-task-has-been-encountered-involved-is-null/m-p/13598279#M92546 jason_lightfoot_adsk 2023-07-20T15:38:03Z https://forums.autodesk.com/t5/flexsim-forum/an-invalid-task-has-been-encountered-involved-is-null/m-p/13598280#M92547 <DIV class="fr-view clearfix">Felix already answered this <A href="https://answers.flexsim.com/questions/146714/2d-1.html">here</A>.</DIV> Thu, 20 Jul 2023 15:41:19 GMT https://forums.autodesk.com/t5/flexsim-forum/an-invalid-task-has-been-encountered-involved-is-null/m-p/13598280#M92547 jason_lightfoot_adsk 2023-07-20T15:41:19Z