Tally.ERP 9 displays the error message Error in TDL during launch


Tally.ERP 9 displays the error message Error in TDL during launch and fails to open.



This error is displayed due to defective TDL/TCP file.

To rectify this error and start Tally.ERP 9,

  • First, de-activate TDL/TCP file from Tally.ini file.
  • Second, launch Tally.ERP 9.
  • Then, activate the TDL/TCP file from F12: Configuration to view the error message and resolve the issue.
  1. De-activate TDL/TCP file:
  • Open Tally.ERP 9 application folder.
  • Open the Tally.ini file.
  • Comment the TDL/TCP line by inserting semicolon (;) at the beginning of the line.


  • Save the Tally.ini file.
  1. Launch Tally.ERP 9:
  • Double click Tally.exe file to launch Tally.ERP 9 in default mode without customisation.
  1. Activate the TDL/TCP file:

You can view the error message by activating the TDL/TCP file. The detailed error message will assist in identifying the issues the need to be resolved.

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To activate TDL/TCP file,

  • Go to Gateway of Tally > F12: Configure > Product & Features > F4: Manage Local TDLs
  • In the List of TDLs to preload on Tally startup field, enter the path along with the name of TDL/TCP file

Note: The path and file name of the customisation file has to be entered correctly including spaces and file extension. For Example: A file welcome.txt is copied in TDLfolder in C drive. In this case, the path for the file will be C:tdlwelcome.txt.

TDL/TCP files will not function, if the name/path of the file is incorrectly entered in the configuration screen.

 Manage Local TDLs

  • Accept the change

Once the TDL/TCP file is activated, Tally.ERP 9 will return to the Product & Features screen where an appropriate error message is displayed. The error message along with the TDL/TCP file can be sent to the point of customisation for correction.

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Tally.ERP 9 displays the error message Error in TDL during launch
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