Request Error

can't read "file_path": no such variable
    while executing
"regsub -all {\.\.} $file_path "" file_path"
    (procedure "ec_return_product_file" line 7)
    invoked from within
"ec_return_product_file"
    ("eval" body line 1)
    invoked from within
"eval $proc $args"
    invoked from within
"ad_return -code error -errorcode $errorCode -errorinfo $errorInfo $error"

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