Normally, if SAP is unable to update or read any text at either header (Table STXH level or item PSTXH level, it will throw this error. So you have to check these tables and find out the root cause of which text is creating problem.
Also SAP have provided a program RVTEXTE to clear such unwanted texts. Fore more details on this, have a look at the following OSS notes:-
- Note 413096 - Correction program RVTEXTE: Old version up to Release 4.6C
- Note 963314 - RVTEXTE - Documentation for the correction report
G. Lakshmipathi