Email Attachment Sending Error. Frappe v15.54, Erpnext v15.50

ERPNext
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1

Frappe Version- 15.54.1
Erpnext Version- 15.50.0

Here is the sample mail I am trying to send->
def send_email_with_pdf_attachment():
try:
# Generate PDF (example using a print format)
pdf_content = frappe.get_print(
doctype=“Sales Invoice”, # Replace with your doctype
name=“SINV-0001”, # Replace with specific document name
print_format=“Standard”, # Replace with your preferred print format
as_pdf=True
)

    # Prepare email
    frappe.sendmail(
        recipients=['recipient@example.com'],
        subject='Email with PDF Attachment',
        message='Please find attached the PDF document.',
        attachments=[{
            'fname': 'document.pdf',
            'fcontent': pdf_content
        }]
    )
    
    frappe.msgprint('Email sent successfully with PDF attachment')

except Exception as e:
    frappe.log_error(f"Error sending email: {str(e)}")
    frappe.msgprint(f'Error: {str(e)}')

The error I get when I execute this via console->

ERROR Property: Invalid value for CSS Level 2.1 property: var(–gray-900) [14:3: color]
WARNING Property: Unknown Property name. [64:2: word-wrap]
WARNING Property: Unknown Property name. [83:2: columns]
WARNING Property: Unknown Property name. [90:2: background-size]
WARNING Property: Unknown Property name. [98:2: object-fit]
WARNING Property: Unknown Property name. [110:2: -webkit-print-color-adjust]
WARNING Property: Unknown Property name. [158:2: word-break]

Requirement-> I want to send email to my customer with some attachment daily, but I get this error when I add an attachment to the code, but without attachment, it is being sent with no issues.

The pdf_content is giving errors I suppose.

For a workaround there is frappe.utils.get_url. But I need the attachments as pdf