 | 1 | initial version |
As the error message indicates, there is no data.txt field. I think the field you're looking for is data.text.
You can check/verify which fields are valid for which version of Wireshark you're using by referencing the online Display Filter Reference page. For example, the valid data fields are currently listed as:
Field name Description Type Versions
data.data Data Sequence of bytes 1.0.0 to 2.6.3
data.len Length Signed integer, 4 bytes 1.2.0 to 2.6.3
data.md5_hash Payload MD5 hash Character string 1.6.0 to 2.6.3
data.text Text Character string 1.4.0 to 2.6.3
data.uncompressed.data Uncompressed Data Sequence of bytes 2.6.0 to 2.6.3
data.uncompressed.len Uncompressed Length Signed integer, 4 bytes 2.6.0 to 2.6.3