your worl flow "workflow.xml" will be like
<?xml version="1.0" encoding="utf-8" ?>
<!-- Customize the text in square brackets. Remove brackets when filling in, e.g. Name="[NAME]" ==> Name="MyWorkflow" -->
<Elements xmlns="http://schemas.microsoft.com/sharepoint/">
<Workflow
Name="MyWorkFlow"
Description="My SharePoint Workflow"
Id="1bf02df9-e620-4dce-8fe1-962b95427758"
CodeBesideClass="SharePointWorkflow1vhf.Workflow1"
CodeBesideAssembly="SharePointWorkflow1vhf, Version=1.0.0.0, Culture=neutral, PublicKeyToken=c6263581358eeda6">
<Categories/>
<MetaData>
<!-- Tags to specify InfoPath forms for the workflow; delete tags for forms that you do not have -->
<!-- <Association_FormURN>[URN FOR ASSOCIATION FORM]</Association_FormURN> -->
<!-- <Instantiation_FormURN>[URN FOR INSTANTIATION FORM]</Instantiation_FormURN> -->
<!-- <Task0_FormURN>[URN FOR TASK (type 0) FORM]</Task0_FormURN> -->
<!-- <Task1_FormURN>[URN FOR TASK (type 1) FORM]</Task1_FormURN>-->
<!-- Modification forms: create a unique guid for each modification form -->
<!--<Modification_[UNIQUE GUID]_FormURN>[URN FOR MODIFICATION FORM]</Modification_[UNIQUE GUID]_FormURN> -->
<!--<Modification_[UNIQUE GUID]_Name>[NAME OF MODIFICATION TO BE DISPLAYED AS A LINK ON WORKFLOW STATUS PAGE</Modification_[UNIQUE GUID]_Name> -->
<StatusPageUrl>_layouts/WrkStat.aspx</StatusPageUrl>
</MetaData>
</Workflow>
</Elements>
You Need to change that as exceptionally
CodeBesideAssembly="MyWorkFlow, Version=1.0.0.0, Culture=neutral, PublicKeyToken=c6263581358eeda6">
<Categories/>
to
CodeBesideAssembly="MyWorkFlow, Version=1.0.0.0, Culture=neutral, PublicKeyToken=c6263581358eeda6"
TaskListContentTypeId="0x01080100C9C9515DE4E24001905074F980F93160"
ModificationUrl="_layouts/ModWrkflIP.aspx"
InstantiationUrl="_layouts/IniWrkflIP.aspx">
<Categories/>