A symbol in square brackets needs more information

Explanation of error:

This formula includes a symbol within square brackets that must be followed by further information in order for it to be valid. For example, the symbol ~ must always be followed by information.

Example:

Task[1088~]

In this example, the symbol ~ is not followed by more information, so it is invalid in this context.

How to resolve this error:

Examine the expressions within square brackets in the formula and ensure that the symbols within each one are used correctly.

The above example could be corrected by deleting the symbol that requires more information, resulting in Task[1088].