I am Unable to Assign group and permissions to file or list

Question

everytime exception occures "Cannot add a role assignment with empty role definition binding collection " , I tried all the solution from other sources still facing same issue..please help.. my code is as below

internal bool AssignPermission(ClientContext p_Context ,SPList MicrosoftDestinationList, Folder DestinationFolder,File DestinationFile,ConcurrentBag<SPRoleDefinations> p_Permissions )
{
string f_UserName = null;
string f_GrpName = null;
bool f_Flag = false;
Principal f_Principal = null;
RoleDefinition f_RoleDef = null;
RDBCollection roleDefBindCol = null;
RACollection ItemRoleAssignCollection = null;
List<RoleDefinition> SiteRoleDefinationCollection = null;
List<string> UserList = null;
bool f_SameContext = false;
try
{
#region CHECK CLIENT CONTEXT
//CSOM need objects from same client context
//Check if client context of the Group/Users is same as the
//current client context. If both are same user current client
//context else get User/Groups again.
if (m_WebGroups.Count > 0)
{
if (m_WebGroups.ElementAt(0).Context.TraceCorrelationId ==p_Context.TraceCorrelationId)
f_SameContext = true;
}
else if (m_WebUsers.Count > 0)
{
if (m_WebUsers.ElementAt(0).Context.TraceCorrelationId ==p_Context.TraceCorrelationId)
f_SameContext = true;
}
if(!f_SameContext)
UserList = GetUsers(p_Context);
#endregion
try
{
if (p_Context.HasPendingRequest)
p_Context.ExecuteQuery();
}
catch (Exception){}
if(MicrosoftDestinationList!=null)
ItemRoleAssignCollection = MicrosoftDestinationList.RoleAssignments;
if (DestinationFile != null)
ItemRoleAssignCollection = DestinationFile.ListItemAllFields.RoleAssignments;
else
if (DestinationFolder != null)
ItemRoleAssignCollection = DestinationFolder.ListItemAllFields.RoleAssignments;
//p_Context.Load(p_SpDestList.RoleAssignments);
//p_Context.ExecuteQuery();
SiteRoleDefinationCollection = m_WebRoleDefinations[p_Context.Web.Url];
foreach (SPRoleDefinations f_RoleDefObj in p_Permissions)
{
try
{
bool f_RoleAdeed = false;
/// m_WebRoleDefinations contains site and its Role Definations
roleDefBindCol = new RDBCollection(p_Context);
foreach (SPROle f_Role in f_RoleDefObj.m_Roles)
{
try
{
// Limited access role is provided by default
if (f_Role.m_Name == "Limited Access")
continue;
RoleType f_RoleType = RoleType.None;
///Check if rolekind is present for the website
if (Enum.TryParse(f_Role.m_RoleKind, out f_RoleType))
{
if (null != SiteRoleDefinationCollection.Where(rd => rd.RoleTypeKind == f_RoleType).FirstOrDefault())
{
var roledef = p_Context.Web.RoleDefinitions.GetByType(f_RoleType);
p_Context.Load(roledef);
p_Context.ExecuteQuery();
//roleDefBindCol.Add(p_Context.Web.RoleDefinitions.
// GetByType(f_RoleType));
roleDefBindCol.Add(roledef);
f_RoleAdeed = true;
}
else
{
/// If role is not found create new role and add to website permissions
f_RoleDef = CreateNewRoleDefination(p_Context, f_Role);
if(f_RoleDef!=null)
roleDefBindCol.Add(f_RoleDef);
f_RoleAdeed = true;
}
if(MicrosoftDestinationList!=null)
MicrosoftDestinationList.BreakRoleInheritance(true, false);
if (DestinationFile != null)
DestinationFile.ListItemAllFields.BreakRoleInheritance(true, false);
else
if (DestinationFolder != null)
DestinationFolder.ListItemAllFields.BreakRoleInheritance(true, false);
p_Context.ExecuteQuery();
}
}
catch (Exception ex)
{ CommonClass.ExLogger.LogError(ClassName, "AssignPermission:: Log 1 :: ", ex); }
}
if (!f_RoleAdeed)
continue;
/// Get user or group and add to RoleAssignmentCollection
f_Principal = null;
if (!f_RoleDefObj.m_Isgroup)
{
continue;
//f_UserName = f_RoleDefObj.m_Members.Select(member =>
// member.m_EmailID).First();
//f_UserName = CommonClass.UserMappings[f_UserName];
//f_Principal = m_WebUsers.Where(usr =>
// ((User)usr).Email.ToLower() ==
// f_UserName.ToLower()).First();
}
else
{
if (CommonClass.UserMappings.Keys.Contains(f_RoleDefObj.m_SpGroupName))
{
f_GrpName = CommonClass.UserMappings[f_RoleDefObj.m_SpGroupName];
f_Principal = m_WebGroups.Where(grp =>grp.Title.ToLower() ==f_GrpName.ToLower()).First();
p_Context.Load(f_Principal);
p_Context.ExecuteQuery();
//SecurableObject securable = p_Context.Web.Lists.GetByTitle(DestinationFolder.Name).GetItemByUniqueId(DestinationFile.UniqueId);
//securable.BreakRoleInheritance(true, false);
//f_roleAssignCollection = DestinationFile.ListItemAllFields.RoleAssignments;
//RoleAssignment rollassign= f_roleAssignCollection.Add(f_Principal, roleDefBindCol);
ItemRoleAssignCollection.Add(f_Principal, roleDefBindCol);
p_Context.Load(ItemRoleAssignCollection);
if (MicrosoftDestinationList != null)
MicrosoftDestinationList.Update();
if (DestinationFile != null)
DestinationFile.Update();
else
if (DestinationFolder != null)
DestinationFolder.Update();
p_Context.ExecuteQuery();
f_Flag = true;
}
}
//f_roleAssignCollection.Add(f_Principal, roleDefBindCol);
}
catch (Exception ex)
{ CommonClass.ExLogger.LogError(ClassName, "AssignPermission:: Log 2 :: ", ex); }
}
//p_Context.Load(f_roleAssignCollection);
//p_Context.ExecuteQuery();
}
catch (Exception ex)
{ CommonClass.ExLogger.LogError(ClassName, "AssignPermission", ex); }
return f_Flag;
}