TO_NUMBER Function Issue

Hi guys,
would like to ask on what cases would a query return an invalid number error? I know if the column has special characters and letters it would return an invalid number when you use to_number function but I currently have a scenario wherein I have whole numbers in a varchar column but i still get invalid number error.
the data that i'm trying to convert to number was from a csv file. When i first loaded the csv data into the oracle external table , it returned an invalid number error. So, what i did was change the data type of the external table into varchar so that it will load the data.
Now what i want to do is transfer the data from external table to a dimensional table. Since the data type in dimensional table is Number , i have to use to_number function to be able to insert the data. I already tried to use to_number(to_char(trim(columnA))) but still wouldn't work.
Any idea? Appreciate your help.
Thanks.

977487 wrote:
I checked the csv file through unix and found that there is a control M in Col2. Believe that's what causes the invalid number error.
You guys are awesome. Thank you very much!Was this data - the .csv file - moved between a *nix and a Windows platform? If so, which direction?
*nix and Windows use a different standard to indicate "end of record". When moving text files between platforms, you have to take that into account. If moving the file with ftp, you have to indicate it is a 'text' or 'ascii' transfer. If you forget, then after the fact you can use the 'dos2unix' or 'unix2dos' utility to fix the file.

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13                                                                                                 replace(coords,chr(10))
14                                                                                                 ,' {1,}',','),'[^,]+')) +
1
15                                                               )
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438, 13
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not sure that is the problem:
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