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Reduce the size of the selection by copying smaller portions of the NC program or data in multiple operations instead of one large block.

Check available HMI memory by accessing Startup > System Data > Memory Overview to verify sufficient free memory exists.

Close unnecessary applications or editor windows in the HMI to free up system resources and clipboard memory.

Perform a controlled restart of the HMI (not NCK) to clear clipboard cache and reset memory allocation if problem persists.

Save all open programs before restarting HMI to avoid data loss.

Verify the protection level of the selected program or data by checking file properties in Program Manager for lock symbols or protection attributes.

Check access authorization level by reviewing user login permissions under Startup > Access Authorization to confirm clipboard rights.

If attempting to copy system data or machine manufacturer parameters, contact the machine OEM for authorization or alternative export methods.

Do not attempt to override protection mechanisms as this may violate license agreements.

For know-how protected programs, use the approved export function instead of clipboard copy if available in your user rights.

Close and reopen the editor or application where the copy operation failed, then attempt the clipboard operation again.

Check the HMI diagnosis buffer under Diagnostics > Service > Diagnosis for additional error messages or warnings that occurred simultaneously.

Verify HMI software version and check for known bugs by accessing Startup > Version and consulting Siemens service documentation for patches.

If error is reproducible, perform HMI software reload from backup or contact Siemens service to investigate potential HMI application corruption.

Ensure valid backup exists before performing any software reload operations.