Error cannot convert varchar to float

See more:

SQL-Server-2005

SQL

SQL-Server

These are my tables

CREATE TABLE [dbo].[dailyRate](
[SYMBOL] [varchar](50) NULL,
[SERIES] [varchar](50) NULL,
[OPENPRICE] [varchar](50) NULL,
[HIGHPRICE] [varchar](50) NULL,
[LOWPRICE] [varchar](50) NULL,
[CLOSEPRICE] [varchar](50) NULL,
[LASTPRICE] [varchar](50) NULL,
[PREVCLOSE] [varchar](50) NULL,
[TOTTRDQTY] [varchar](50) NULL,
[TOTTRDVAL] [varchar](50) NULL,
[TIMESTAMPDAY] [varchar](50) NULL,
[TOTALTRADES] [varchar](50) NULL,
[ISIN] [varchar](50) NULL
)

CREATE TABLE [dbo].[cmpDailyRate](
[ID] [bigint] IDENTITY(1,1) NOT NULL,
[SYMBOL] [varchar](50) NULL,
[SERIES] [varchar](50) NULL,
[OPENPRICE] [decimal](18, 4) NULL,
[HIGHPRICE] [decimal](18, 4) NULL,
[LOWPRICE] [decimal](18, 4) NULL,
[CLOSEPRICE] [decimal](18, 4) NULL,
[LASTPRICE] [decimal](18, 4) NULL,
[PREVCLOSE] [decimal](18, 4) NULL,
[TOTTRDQTY] [bigint] NULL,
[TOTTRDVAL] [decimal](18, 4) NULL,
[TIMESTAMPDAY] [smalldatetime] NULL,
[TOTALTRADES] [bigint] NULL,
[ISIN] [varchar](50) NULL,
[M_Avg] [decimal](18, 4) NULL
) 

this is my insert query to fetch data from table to another with casting

INSERT into [Stock].[dbo].[cmpDailyRate]
SELECT [SYMBOL],[SERIES],Str([OPENPRICE], 18,4),Str([HIGHPRICE],18,4),
Str([LOWPRICE],18,4),Str([CLOSEPRICE],18,4),Str([LASTPRICE],18,4),Str([PREVCLOSE],18,4),convert(bigint,[TOTTRDQTY]),Str([TOTTRDVAL],18,4),
convert(date, [TIMESTAMPDAY], 105),convert(bigint,[TOTALTRADES]),[ISIN],null
FROM [Stock].[dbo].[DailyRate]

above query run perfectly in sql2005
but giving error in sql2008(above query run also in sql2008 when installed ,error arise in last few days )
error :Error cannot convert varchar to float
what to do?