Hi,
I want to close opportunity as lost. But getting the following error message

and the Log File - ErrorDetails.txt is given below.
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/"><s:Body><s:Fault><faultcode>s:Client</faultcode><faultstring xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US"
/><detail><OrganizationServiceFault xmlns="http://schemas.microsoft.com/xrm/2011/Contracts"><ErrorCode>-2147220891</ErrorCode><ErrorDetails><KeyValuePairOfstringanyType><a:key xmlns:a="http://schemas.datacontract.org/2004/07/System.Collections.Generic">OperationStatus</a:key><a:value
xmlns:a="http://schemas.datacontract.org/2004/07/System.Collections.Generic" xmlns:i="http://www.w3.org/2001/XMLSchema-instance" i:type="b:int">0</a:value></KeyValuePairOfstringanyType><KeyValuePairOfstringanyType><a:key
xmlns:a="http://schemas.datacontract.org/2004/07/System.Collections.Generic">SubErrorCode</a:key><a:value xmlns:a="http://schemas.datacontract.org/2004/07/System.Collections.Generic" xmlns:i="http://www.w3.org/2001/XMLSchema-instance"
i:type="b:int">-2146233088</a:value></KeyValuePairOfstringanyType></ErrorDetails><Message /><Timestamp>2015-09-30T03:04:47.8279242Z</Timestamp><InnerFault><ErrorCode>-2147220891</ErrorCode><ErrorDetails><KeyValuePairOfstringanyType><a:key
xmlns:a="http://schemas.datacontract.org/2004/07/System.Collections.Generic">OperationStatus</a:key><a:value xmlns:a="http://schemas.datacontract.org/2004/07/System.Collections.Generic" xmlns:i="http://www.w3.org/2001/XMLSchema-instance"
i:type="b:int">0</a:value></KeyValuePairOfstringanyType><KeyValuePairOfstringanyType><a:key xmlns:a="http://schemas.datacontract.org/2004/07/System.Collections.Generic">SubErrorCode</a:key><a:value xmlns:a="http://schemas.datacontract.org/2004/07/System.Collections.Generic"
xmlns:i="http://www.w3.org/2001/XMLSchema-instance" i:type="b:int">-2146233088</a:value></KeyValuePairOfstringanyType></ErrorDetails><Message /><Timestamp>2015-09-30T03:04:47.8279242Z</Timestamp><InnerFault
xmlns:i="http://www.w3.org/2001/XMLSchema-instance" i:nil="true" /><TraceText xmlns:i="http://www.w3.org/2001/XMLSchema-instance" i:nil="true" /></InnerFault><TraceText>
[WBI.CRM.Customization.Plugins: WBI.CRM.Customization.Plugins.OpportunityLose]
[f24fd916-af77-e311-b789-00155d0270fd: WBI.CRM.Customization.Plugins.OpportunityLose: Lose of opportunity]
</TraceText></OrganizationServiceFault></detail></s:Fault></s:Body></s:Envelope>
I am not able to find the issue. Please help me to fix it. I am using CRM 2015 version.
Thanks in advance for your help..
Regards,
Dhanisha