> For the complete documentation index, see [llms.txt](https://docs.sannybuilder.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.sannybuilder.com/troubleshooting/errors/0014.md). # 0014: Incorrect expression There is an expression used without an opcode, and the operand types are incompatible. The operands are incompatible when: * one operand is a variable which type has been [declared](/language/data-types/variables.md#declaring-a-variable-type) using the `var` keyword, but the type of another operand is different: ```pascal var 0@: Int 0@ = 1.0 ``` * both operands are variables that were not declared via `VAR..END` * one of the operands is impossible. For example, a number on the left side of an assignment statement: ```pascal 5=6 ``` **Possible solutions:** check the correctness of this expression. Either: * re-declare the variable with the correct type * declare both variables using the `var` keyword * fix the expression using correct values\\ --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.sannybuilder.com/troubleshooting/errors/0014.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.