Problem in conversion programs from NE 4.0 to NE 5.1

I have to do a conversion from NE4 naar NE5.1 and have to compile all programs.

Now I have a problem with all programs, that have the command " EXEC HTML "
The HTML-code made in the programs gives errors when I compile them with NE5.1

The error :
- Error at line 898, column 7 in file RC101P.sks
- PCB-S-00401, Character string not properly terminated

I copied the code to a 'online html compiler '.
The code has no errors and the screen is ok.

How can I solve this problem ?

What wrappack level of Net Express 5.1 is installed?
Open the Net Express IDE and select Help-->About Net Express from the IDE menu.

What is the full version number that is displayed?

Thanks.