# Workflowgen 7.0 - Numeric Data Parameter

**URL:** <https://discuss.workflowgen.com/t/workflowgen-7-0-numeric-data-parameter/787>\
**Category:** General WorkflowGen Discussion\
**Created:** [June 7, 2017, 7:08am UTC](https://discuss.workflowgen.com/t/workflowgen-7-0-numeric-data-parameter/787 "2017-06-07T07:08:17Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![santhosh.james](https://avatars.discourse-cdn.com/v4/letter/s/65b543/32.png) [@santhosh.james](https://discuss.workflowgen.com/u/santhosh.james)\
**Post date:** [June 7, 2017, 7:08am UTC](https://discuss.workflowgen.com/t/workflowgen-7-0-numeric-data-parameter/787/1 "2017-06-07T07:08:18Z")

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Hi ,

We are not able to create process instance in Workflowgen 7.0 when we have workflowgen process with numeric data parameter . We got following exception from workflowgen. We don’t have .Net framework 4.6 on workflowgen server and we have only .Net framework 4.5.2 on workflowgen server. Please guide me how to solve this error.

ProcessInstanceStart has thrown an error: Method not found: ‘System.String System.String.Format(System.IFormatProvider, System.String, System.Object)’.  
System.Exception: ProcessInstanceStart has thrown an error: Method not found: ‘System.String System.String.Format(System.IFormatProvider, System.String, System.Object)’.  
at Advantys.Workflow.Engine.WorkflowsManager.ProcessCreateInstanceWithContextDataSet(Int32 processId, String processName, Int32 processVersion, Boolean test, DataSet contextDataSet, WorkflowUserIdentity requesterIdentity, WorkflowUserIdentity realUser)  
at Advantys.Workflow.Web.Services.Processes.Runtime.RuntimeService.StartProcessWithContext(String workflowContext)

Thanks,  
Santhosh

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**Author:** ![eddy.daouk](https://yyz2.discourse-cdn.com/flex030/user_avatar/discuss.workflowgen.com/eddy.daouk/32/672_2.png) [@eddy.daouk](https://discuss.workflowgen.com/u/eddy.daouk)\
**Post date:** [June 7, 2017, 11:46am UTC](https://discuss.workflowgen.com/t/workflowgen-7-0-numeric-data-parameter/787/2 "2017-06-07T11:46:52Z")

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Hi Santhosh,

To solve this error, you need to install .NET Framework 4.6.1 or higher on your web server.

It is a system requirement of WorkflowGen 7.0.0 and higher:  
[https://advantys.gitbooks.io/workflowgen-technical-reference-guide/content/system-requirements.html](https://advantys.gitbooks.io/workflowgen-technical-reference-guide/content/system-requirements.html)

Best Regards,  
Eddy.