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i may suggest you to check two things: 1. if the recommended version of tcl/tk along with all the header files and the libraries is properly installed. 2. if the path of the tcl's include directory is provided to the workspace, i.e. if the path "c:\...\tcl\include" is known to the project>...

i've also faced similar problems in the past. here are a few steps that might help you: 1. install the latest version of tcl/tk including the libraries and the .h files. 2. say your compiler where to find them. from the error number i assume that you use the visual studio, so go to menu item project...